Could be a very boring fight though, specially if Whittaker did his homework.
If you lead against Izzy, he pieces you up, but if you stand back and don't engage, your chances of beating him increases, but the fight could be a bore-fest. The Romero and Jan fights are example of this.
Now, those guys have one hit KO quitter, so Izzy was obviously aware to not close in on them. Rob doesn't have that KO power (nor the reach), so maybe Izzy will approach it differently and push the pace on Rob, forcing him to abandon the game-plan and rush in.
Don't think wrestling/grappling gonna be much of a factor. Bigger stronger fighters have tried to keep Izzy down unsuccessfully, so it would be a waste of energy for Rob to try that, and the same can be said for Izzy trying to wrestle Rob. Although if somehow Izzy gets tired, and Rob can get his back on those championship rounds, shit could get interesting.
Personally, expecting a Izzy decision, but hopefully, not a boring one.
I like both guys, but would be happier if Rob wins it.