Training pots don't worth it at all, recruiting a ninja will give u more power than 200 pots.
Wouldn't recruit Gengetsu either, as he's in seal treasure, redeemable for ninja points and also drops frequently from infinite illusion packs. In time you'll have him 5 star.

Danzo is a solid choise, and who knows, maybe we'll get same firework again next month, like we did last time?.. and then you could BT him. But if not, the power from recruiting either of those ninjas is nice.