Why Is Nobody Calling Out Vitali?

Just read on Boxingscene a report on the available options for Wladimir Klitschko. David Haye and Odlanier Solis both released statements after Wlad's victory basically calling Wlad out. Alexander Povetkin wants Wlad next but that's an obvious one as he is the mandatory! Chris Arreola has stated when the Haye vs Wlad negotiations were falling apart (before a deal was reached) that he wanted Wlad! But nobody seems to be talking about fighting Vitali! I think David Haye is the only one that has mentioned maybe fighting Vitali. Vitali himself has been fairly quiet of late aswell. I thought more people would have been ready to call out Vitali as he doesn't have to face Maskaev anymore and he has the WBC title! I thought Vitali would have started setting up a fight for later on in the year. Maybe he will! Is it a case of Wladimir has more belts and the fighters want to beat the number 1 ranked heavyweight? Or do they fear Vitali?