I think eventually both Wentz and Dak will fall out of the running for different reasons. Dak probably won't start enough games to win it. Wentz will eventually lay a huge egg, which will hurt him quite a bit. You can stack the box on Zeke and limit his YPC, but opponents can game plan Wentz as soon as they get enough tape on him and his sledding will get a lot tougher.
If Zeke stays healthy, I think he will win rookie of the year, going away. I realize that if Wentz continues winning, that he will have the momentum and could beat out Zeke due to positional bias and East coast bias. I just see Wentz coming back down to earth.
Dak is better than Wentz, he just may not get a whole season to prove it out. Moreover, Wentz currently is playing with a much better defense than Dak or Zeke. Without that defense, he stands a much bigger probability of getting exposed sooner.