I don't think people realize how talented The Dream Catcher is. He poses an interesting matchup...one I'd very much like to see. I also wanted to see him vs Anderson Silva at one point.
Meanwhile Gustaf is a legitimate threat although I don't think he's strong enough to withstand JBJ. He should be able to TKO Thiago Silva or win a UD.
So...I think what's going to happen is this.
Either JBJ beats Rashad, Hendo, Gegard, Gustaf, Shogun x 2, Machida x 2 and cleans out the division.
Then The Spider comes in and either defeats em or passes the torch to em.