I currently have 4 builders. I am getting close (2 months probably) to maxing everything but walls and heroes at TH9. This means I will only need 3 builders for the rest of my grind (one for BK, one for AQ, and one for walls).

My question for TH10s out there, is do you need that 5th builder? Do you keep it busy?

Given the high cost of most of the structures I figure that I'd be lucky to keep it going as I'm starting to have a hard time keeping 4 busy now with costs of defense upgrades. Thoughts?

Edit: I'm asking because having that extra one now would speed things up by a couple of weeks for me.