Trying to vehemently justify a double standard is a sign that your anger lies elsewhere--in something you AREN'T saying.
Henderson KOed a guy who couldn't hack it at WW and who was unranked at MW. He doesn't deserve a title shot.
And neither did Bisping.
And Woodley beat a guy who took him seriously, and he's definitely one of the best guys in his division.
Bisping is none of those things.
So, you're right. They shouldn't be lumped together.