I think my favorite incubator egg has died

On the other end of the scale I'm pretty sure one of the others has internally pipped! (and I'm sure another is not far behind!)
As for what's going on outside, the girls are sitting strong! Wax crayon seems to be holding up although fading. When should I re-candle? Do I even need to candle again or just leave it now, at least until they are over due?
Whenever I go outside Bo (drake) is outside on his own and all three girls are inside. Still just the two on nests as I have been removing Johnny's eggs, and she quickly comes outside when she sees me. When I have managed to see her before she sees me she is sat nest to Crispin's nest. (This isn't where she has been laying her eggs) She looks like a visitor at someones bed side in the maternity ward
I am worried though....
1 - is there something I can do for Bo? I feel sorry for him being on his own most of the day

2 - Is Johnny either depressed that the other two have eggs and I keep stealing hers and/or could she be trying to hijack Crispin's nest? Are there any warning signs I need to look out for?
Thanks