Personally, I don't understand why it is so important for many that they be able to sleep at night knowing who's labelled as the #1 goalie. Who cares?
If you look at Minnesota the past few seasons, they seem to have been doing very well rotating goalies and I don't recall them being known for giving up too many goals as a team over the entire season.
I think a more appropriate question would be.."Who's playing better?". IMO that would definitely be LaBarbera. I hope the rotation can give him an opportunity to stay fresh the entire year, rather than burnout too early.