In the slot, you're not going against corners, unless they are 3d corners. Also, they don't jam slot receiver as much as corners do on the outside. I'm not saying he's going to make the 53 roster right away. But I believe he's in a great position.
You're right, I should've said "NFL defenders", not just cornerbacks.
I really think it comes down to outperforming Cowing and taking his job. That's realistically the only way he's making the 53.
They took 7 WRs on the 53 last year. Jennings, Pearsall, Robinson, and Watkins are pretty much locks to make the team, and Aiyuk will be once he's healthy. Isaiah Neyor has huge upside, and could steal a spot. They have a couple other guys that will likely be camp bodies/practice squad level, one of which might grab a spot while Aiyuk is out. There are also rumors about the Niners maybe going after Amari Cooper.
But they're basically only keeping one of Bergen and Cowing.
I'm hoping that having the worst ranked specials teams in the NFL last season maybe biases the coaches to take the new guy, though. lol
I'd love to be wrong and see Bergen shine as a WR and nab his spot that way, for sure, though.
If he doesn't stick with the Niners, I'll be very sad, but I'm hopeful he'll grab a practice squad spot somewhere.