Well thought out speculation, one I didn't think of myself, or would have thought anyone would connect this game to that series just from Yoshi's hints. I remember I found this lil' gem, possibly one of my favorite Animes of all time, when I played FFXI and always thought "Huh, that would be interesting in a game, to see summons fly out of your gun!"

Alas, I just don't see that happening, until maybe the Garleans find their own means of "summoning" and use "Magun" type weapons to do their summoning (that would be an interesting twist of events huh?) Still it does beg the question what Yoshi's hints meant and why that specific reference of that specific title was mentioned. Just my thoughts, I could see BLU being brought in only if they did it like FFX-2's BLU, with the bullet system of learning monsters abilities. Though Yoshi doesn't seem too keen on trying to implement BLU just from some of his earlier comments. It's still a mystery wrapped in an enigma to me personally, but I can't wait to see what this "Gun" or "Agent" job turns out to be!