If things goes well, she will be in a 30FG gacha around november/december. Same for Hinoki. Usagigoke swimsuit will be in a 30FG gacha somewhere during summer.

I think buffs for 1 Ally are good when you can easily target the ally. Back in the time, there were buffs for less than 5 but targeting random girls (ex old Kerria) and it was hard to use and not that great. For 1 Ally Type] is great indeed. Being able to change ally type as you want help a lot. The only limit is when you want two buffs targeting different types.
[For 5 allies] is still great when you rely on multipe attacking girls. I don't really know if 5 main girls teams are as good as 1 main 4 support. I guess it's the case for more defensive team build like counter or pure intercept.