depends on your lens.
Germaine had a belt and publicly acknowledged she'd rather change weight classes than face the #1 contender. who knows what she said in private. so she got stripped.
Bisping took a rematch Dana pushed onto him thinking the fans wanted it (many did, even though many of them who did now deny it), then accepted an even bigger payday, then had surgery, then the surgery took longer to recover from than expected. can't blame a guy for wanting a big payday with GSP if offered, but at the end of the day he's currently injured and once healed will either fight a big payday offered to him by Dana (GSP) or the #1 contender.
or
he insisted on fighting a #13, then faked an injury to duck a #1.
i personally have never once in 20 years of being a fan accused a fighter of faking an injury to duck a competitor, and i won't now. if they're not comfortable fighting, they shouldn't fight, and that's their right and obligation to themselves. and i am far from a Bisping fan. because being a reasonable mma fan is more important than changing your mind about what is appropriate behavior based on whether you like a fighter or not.
TLDR: mostly Dana is at fault at 185, IMO