I didn't even think of leaving a buddy in there! I felt like such a jerk immediately after when I realized I'd left #7 all alone! Hopefully #8 pulls through so they have each other to hang with until they're ready for the brooder!
Quote: Leaving just one chick in the bator is fine, especially if another is hatching.
Ya gotta kinda play it by eye and ear...sometimes the groupings work out great other times not so much.
Just do the best you can.