I think the between the ears stuff is particularly important to this coaching staff and front office. That, plus leadership.
As fans, that's what is tough to evaluate. Herbert probably has the best tools of any quarterback in this draft, but does he have the smarts to run a sophisticated offense? Tom Brady never blows you away with his tools, but always makes great decisions.
That's what Miami is looking for. Trent Dilfer says that Tua learns quickly and turns weaknesses into strengths. One opinion, but that's impressive.
Fromm also has to be in consideration.