1)In the novels Bright stayed on Earth and Alberto went together with Riddhe towards Industrial 7:
That's very different in the OVA since Bright won't be in Earth to slow the Colony Laser firing(nor arrest Martha after) and Alberto won't support Riddhe with more Psycoframe to activate the NT-D(the OVAs show Riddhe as an already weak Newtype, the Armed Armor XC will take place of the Banshee's spare parts and the teaser confirmed Riddhe will activate NT-D against Marida). Alberto also won't be part directly of the events that led to Marida's death in the novel though if she dies in the OVA she may be able to telepathically communicate to say goodbye to him as per novel. Perhaps Kai will take Bright's role in the Cheyenne base along Albert who wants to protect Marida.
2)Tristars and Ra Cailum.
In the novel Angelo and Frontal destroyed the Tristars' support ship and another, forcing them to search another ship and head to the final battle in Base Jabbers. Ra Cailum may enter the battle at some point in OVAs(perhaps aiding the Nahel against the Tennyson Fleet) since it stayed on Earth in the novel. Since the Tristars will definitely have their moment protecting the overheated/jammed Unicorn there's a chance Watts will die enabling Banagher to escape the Psyco Jammers as per novel. Funny that the General Revil never saw any action in the novels but has already seen in the OVA, plus it's going towards Industrial 7 right behind Riddhe.
3)The Riddhe boss battle timing
In the novel Banagher fought the Banshee after blitzing through the Tennyson Fleet and fighting both Angelo and Frontal before reaching Industrial 7. The OVA put the Riddhe fight even before fleet battle and the only motivation I can see for this is saving Marida since she dies protecting the Nahel's bridge from Beam Magnum shot from the Banshee while Banagher and Mineba tried to calm down the crazy Riddhe. The teaser clearly shows that Marida stayed back to hold the NT-D Banshee while Banagher went ahead to pierce through the fleet. Unless Riddhe kills her the same way if Zinnerman focus the Nahel's defenses to help her and she agains takes the shot. Also take note the Banshee is more heavily armed and has more mobility in the OVA(no Hyper Bazooka but it has the Revolving Launcher and Armed Armor DE Mega Cannon). The staff also pointed out the spare Revolving Launcher on the rear waist carries different ammo from the one used onscreen, nukes?
4)Nahel Argama's defense MS squad
Novel: 1 Rezel, 1 Stark Jegan, 2 Lotos, 2 Geara Zulus and Kshatriya(mostly ok, still had some funnels and all 4 binders)
OVA: 3 Rezels(2 already heavily damaged by the Banshee), 1 EWAC Jegan, 1 Jegan(already heavily damaged by the Banshee), 5 Geara Zulus(2 being Royal Guards), 2 ECOAS Jegans, 3 Lotos(at least these 3 survived OVA 3 intact) and Kshatriya Repaired(completely obliterated in the OVA before being repaired)
HUGE difference here! This means either the FA Unicorn will do less work destroying the Tennyson Fleet(he got more than 20 MS alone plus disabling lots of Musakas) since only it and Kshatrya were actively attacking the fleet and rest was just defending the Nahel; or the Nahel will be less damaged(lost another catapult in a reactor explosion) and be less in danger in general allowing it to move foward faster. It's known before they got the greenlight for OVA 7 that they heavily damaged the Kshatriya in OVA 3 thinking it wouldn't be used again in the OVAs. From the teaser I can't tell if the Kshatriya Repaired had already detached its huge booster and there may be something in place of the funnels in the binders but besides that the Kshatriya will have a hard time in the OVAs.
5)Gael's role
In the novel he had his moments but in the OVAs he's mostly just a background character. He was aboard the Nahel in the novel but in the OVA he's already with Siam. His role in the last volume was allowing Banagher to board the Unicorn in turn being killed by Frontal. He and the Tristars will definitely have their chance in the spotlight in the last OVA.
6)Frontal's ride and boss battle timing
In the novel Frontal had a pretty cool fight in the Shoal Zone against Banagher right after Angelo tried to commit suicide, then Marida appeared against Zinnerman's orders to hold Frontal while Banagher went ahead to Industrial 7 but met NTR Riddhe. Marida was actually a key factor in the novel since she was the one which finally managed to heavily damage the Sinanju(its entire left side was molten) by using the her binders as missiles and surviving the battle with the Red Comet only to die later. In the OVA Frontal gets a new ride and new pilot suit
. People that have seen the new MA say it resembles the Dendobrium so expect it to be VERY powerful and do some damage to the heroes and even get some kills. Therefore it's safe to say the final and only battle against Frontal will be after Banagher meets Siam and the new MA will engage both Unicorn and Banshee in a spectacular battle since the final battle in the novel was a half molten Sinanju with just a Beam Saber/Rifle against 2 intact Green NT-D RX-0s with Beam Magnums. Oh and Frontal was also bleeding profusely in the cockpit after being shot by Banagher. The poor sod never had a chance 7)Rainbows
From the promo poster the rainbow stuff is still in so don't complain when you see the Unicorns deflecting a Colony Laser Shot with just Psyco Frame magic
That's it for now, just want to say the OVA event order will be something like this: short Banshee VS Unicorn fight>Fleet Battle>Rozen Zulu boss battle>Box reveal>Frontal boss battle>Colony Laser>Epilogue
