Great fight, Bisping should get a UD, late TKO is possible too.
What Boetsch did in his last fight was great, but not many guys make a habit of such performances. The reason I don't think he'll repeat it against Bisping is that Bisping sets a much higher pace than Okami and will increase the pace if he's having his way.
Okami was having his way with Tim but kept the same pace, seemed content with the combos he landed and didn't pressure. That is why Tim's aggression in the 3rd completely surprised him and he got clocked.
Bisping should be able to tire and hit Boetsch enough early in the fight to prevent such a comeback.