@talleman - from your description I'm in the exact same situation as you & I just open tokens once I get to 20CP. I may not finish with completely covered characters before they exit the pool, but they are extremely usable, and I could not have said the same about my 4* characters prior to vaulting.
byc said: You should save CPs and Latest Legend tokens for building 4*s as well as good 5*s. Gambit is pretty solid. Plus the game is starting to require 5*s for placement rewards. Even if you're not playing at SCL9, you should be able to do SCL7 or 8 at a good clip.