Romero & Whittaker were both somewhat close to beating Adesanya. It wouldn't shock me if Strickland was able to win a close decision with his style though I certainly wouldn't bet on it.
I think it's a bit under the radar that Adesanya just hasn't really done much in many of his recent fights.
I think you're right that the more he plays this game of going to a decision with razor close rounds, eventually a couple of the judges are going to see it for the other guy. I just don't think Strickland is the guy to do it. Frankly, I just don't think he's explosive enough to be able to land on Izzy. I think Izzy would see his shots coming from a mile away and light him on fire.
Whittaker is still probably the best equipped to beat him, but the next guy in the division on that list might be Till. He obviously doesn't deserve a title shot without picking up a few wins first, but Izzy wants to fight to him, so he might get there quicker than he should. I'd still pick Izzy and I think it would be a boring fight, but Till's capable of playing that chess match.