The thing about Signum teaching Archery. Where would it come from?
I mean, Shirou is not going to show any interest or talent towards Archery at all. Swordsmanship, yes, he'll definitely show interest and talent for it, and you add his Tracing ability then it's rather obvious that swordsmanship should be his focus.
I think it would be odd to just out of the blue take your swordsmanship student and shove a bow into his hands. Espeically with what Inugami saying with how odd it is for them to have a bow at all. Then again Signum is from way, way back, where something like that maybe more normal.
Also, Shirou isn't getting a Barrier Jacket. I thought about it, and even thought about doing it the way it was done in Nanoha 1/2 but then ditched it in favor of just having Shirou store armor. Mainly because I trashed the idea of teaching Shirou Mid-childa based spells intermixed with his own Tracing.
Because that would have just been stupid.