Quote Originally Posted by Unregistered View Post
I'd recommend the exact opposite.

Grab 4* off the blueprints to buff out early forces.
Pick up 5*s from monthly, blueprints, events and what not over time.

Save your cores for Events to roll guaranteed 5*s.

Not even any reason to get 4th now that Events or Random can give 5*s.
Spending BPS on 4* is a waste since you get like 1 4* every 2 days from factory. And all of them eventually will be replaced by 5*.
BPs are only for 5*.

There are reasons to get 4th slot as factory is basically like a f2p gacha using common materials and can give you high tier units.

Still it's all up to rng.

Saving cores for events is a good idea, I've completely forgot about that.