Good locker room relationships can carry a team through a losing streak, unforeseen setbacks, and other rough patches; bad locker room relationships can divebomb a team's season to misery if things start going bad independent of those locker room relationships (like losing).
Talent trumps positive locker room relationships. By a lot.
Negative locker room relationships should have little impact for on-the-field execution of professionals.
Winning more often begets positive locker room relationships than the other way around.
But I could be wrong.
I'll add that in the playoff game against the Eagles last season, players on the Viking defense held the Eagle offense to no touchdowns through the first three and a half quarters, while watching Tarvaris Jackson struggle mightily as the Viking offense squandered away any chance of winning the game. I'm just saying.