Trent Dilfer has a ring not because he was elite, but because he was on a strong team with a very good defense, o-line, and running game. So yes, even a QB like Tua could win a Super Bowl. But, he's not going to do it in Miami unless changes are made. Tua is NOT like an Allen or Mahomes, so he needs an above average, tough, physically dominating o-line to protect him. However, one, Grier can't even build an average line, and two, McDaniel seems to be another Philbin who prefers a finesse line to execute his fancy blocking techniques. Also, McDaniel has no experience as a "real" OC calling plays, so his inexperience and stubbornness hurts the offense at times.
IMO, when Grier gutted the roster for the rebuild, that was the time when he should have started laying a strong foundation for a tough, physical team, but four years later we see that he didn't care about "winning in the trenches", or having a defense that could hang with the top teams.