I keep reading different posts that kind of surprise me. At 149 last year Zain was just flat out miles ahead of the field. The thing is, other than not being able to deal with Zain Sorenson was as far ahead of everybody else as Zain was of the Hawkeye. Sorenson isn't known for his high octane offense, but he is always perfectly positioned, always wins the hand-fighting, always escapes quickly, can ride brutally and when he does shoot he has a very high percentage of takedown finishes.
Putting Zain in a class by himself, and then considering serious challengers in the next tier down. I have seen nothing that lets me believe a healthy Brandon Sorenson is going to be seriously challenged by anybody other than maybe a healthy Tsirtsis (and I even doubt that).