How old is Flint supposed to be again ?
Flit Asuno - 14 years old at the start of his story.
Asemu Asuno - 15 years old at the start of his story
Kio Asuno 13 years old at the start of his story
How it comes up with a sudden and super-effective weapon in the first place, though, will be interesting to hear a good explanation of, especially without taking a good long time to sit and scan a Gafran or anything.
Weapon was designed based on the combat data from ep 1, not from anything done in ep 2 on the fly