I have been doing lots of evaluating of the upcoming draft, and per the usual I tend to specialize in QBs, I also use a NFL scout as a resource for my own work. We do tend to disagree on some of these, but the general consensus is that if Tua comes out, 4-5 QBs will go in the first round of this years draft. With Cam possibly having a 11 month recovery time, it very well may be time to find a suitable replacement.
My rankings:
1. Justin Herbert
2. Tua Tagovailoa
3. Joe Burrow
4