Josh Rosen.....just in case?

I’m new to dynasty and am in my first league. I’m contemplating picking up Josh Rosen, since he clearly is going to be out in Miami and apparently some teams are showing interest. It’s a deep league; 14 teams with 30 roster spots and an additional 4 for a taxi squad. My options to get him would mean dropping one of these 3; Kaepernick, Dez Bryant, and Chester Rogers. Anyone have any thoughts?