Only took me 10 stamina to get Garret. I can see it being completely random like that all week going up and down.

I only have Leeanne at 50CC30 so 2 Heavy Infantry in this event is a godsend for me even if one is crap. By the sounds of it I'm better off waiting for Bernice and levelling/CCing her. I have a spare Leeanne to CC her with.

After seeing the wikia its clear some units I don't really need as I already have them. Handy for CR/Skill up though. I guess those ones are the ones I leave until last in case I don't get them in time.