I don't see Bisping going in with a take down heavy gameplan. I can't remember him ever taking someone down from a straight shot but of course its happened, its just not his thing. Sure, he may have been working on his TDD, and has shown this ability as well as the ability to get to his feet, but this doesn't mean he's gonna wrestle Stann.
Striking is his bread and butter, his Ego is behind it and he's gonna try to prove to Stann that he's better there. It probably offends him that Stann thinks he'd prefere to grapple him.