Grier is 24+ years of age and you never want to get a QB who is that old on draft day.
Grier is not in the elite class of quarterbacks because of non-elite arm talent. He made very few elite passes in college and has trouble zipping it far.
Grier's frame is also not ideal, at 6-2, 215, and he took too many sacks in college, which is a bad combination -- less than ideal frame, sacks, and not elite arm talent is a bad combo.
One thing to like about Grier is that he is a gangsta, scores a ton, and throws it deep. The problem is, the ball often hangs in the air.
Will Grier is not a first round quarterback, and the Dolphins have no need for any player who is not first round value, let alone a QB who is not elite, first round value.
In this draft the Dolphins should move up and get an elite quarterback.