I am the commissioner for our fantasy league. And I'm asking for your opinion on how to handle a problem.?

The regular season for fantasy football is about to come to an end. It is extremely competitive in my league since there are 4 teams that have the same exact records with only 2 spots left in the playoffs. There was one matchup that jumped out at me and that was between the #2 seed and one of the 4 teams fighting for a playoff spot. The #2 seed has already clinched a playoff spot and the worst seeding he will get is 3rd even if he loses the remainder of his games. I believe that the #2 seed is throwing the game for the lower seed team so he gets a better chance to get in the playoffs. The #2 seed is benching RB Chris Johnson, WR Reggie Wayne, David Akers, Cowboys D vs. Oak, WR Greg Jennings. In favor for Rashard Mendenhall, Matt Prater, Steve Smith (Car), Saints D vs. Pats, and Steve Smith (NYG). Is this a blatant attempt to help a friend? Because in my opinion There is no way you can bench Chris Johnson and Reggie Wayne against any team. And the Cowboys D is a much more favorable matchup than the Saints D against the Pats. And the players benched this week were all starting last week (except the saints D). As the Commish, should i step in and do something about this?