Thank you for asking, WVduckchick, it didn't end up happily for that one chick, by this morning it was obvious it had died.I'm waiting on the other 5 today, the mother won't let me check under her at all and I don't want to do more harm than good. Wish us luck.
I'm sorry. It's hard to guess what happens under a broody sometimes. We usually just have to trust that they know best. I probably would not have made the call to take the egg, although in retrospect, that probably would have been the better decision. The only broody eggs I have messed with were ones that momma left, but I could tell were still alive. So I assisted. But if one doesn't hatch while she is sitting, then I figure more was wrong.
Good luck with the others, and please let us know how it goes!