He's got the arm and he's 6'6" and stout and athletic for his size. There is that question of leadership that Burrow and Tua do not have, they are considered good leaders.
Eason is the forgotten man to me and he's the exact same size as Herbert with a cannon. Jordan Love is also an interesting prospect.
The one thing that I don't like about Tua is that he's 6'1", I think Prescott's 6'2" is a hindrance and he's too throwing lane locked. On a lot of those crossers, he is hindered by the lane and speed of the WR. By the time the WR hits the lane, it's too late to hit him in stride and many of those throws are late.