Mariota has more to overcome and prove than Bortles, imo. Bortles is a more traditional QB, and it will be harder for defenses to "figure him out". Mariota, on the other hand, leaves something to be desired as a passer, but is a tremendous athlete. Kind of like, you know, RG3. History favors QBs whose game is not predicated upon the ability to run fast, and Mariota will have to prove that he can be a pocket passer or end up just another talented mid-pack guy.

---