BK is awake right now because I elected to use a builder to work on collectors. The main reason being to space out my builders. If I had upgraded BK, I would have a 2-3 day gap without any free builders which is bad. This also means that my DE is more likely to overflow, but I will probably upgrade BK before that happens
Warden going to lvl7 right now, his shorter upgrade times are drawing to a close. With 12 hours added for each upgrade, he now needs a 3 day wait between upgrades. It will only get longer which is boring.