Schad seems to provide us with some good coverage. I agree with much of what he said. I'm higher on DeVante Parker and Xavien Howard than some on this board, but I'm not yet convinced on Phillips. Phillips showed some flashes last year, but didn't play nearly enough snaps and wasn't very good against the run. Neither of those are acceptable negatives. Together they are reasons why he should be looking at every DT in camp as true competition.
For the offensive players, I think it starts and ends with the OL. If they can stay healthy (and that includes Pouncey), and Isaac Asiata can come in and earn a starting guard spot, we should be a decent running team. That allows Tannehill to play-action, which is a strength of his. It also slows those pass rushers, providing more time in the pocket for deeper throws and slower developing route combos. Guys like Parker will have a lot more time to shine if we have a running game to slow the pass rush and extend drives.
Defensively, Schad is using the shotgun approach. We have a lot of guys who could make a big leap forward, but my money is on Howard and McMillan. Howard showed well in his limited playing time last year. The biggest adjustment issues he needed to make were made, such as limiting his grabbiness, shadowing receivers, understanding his role in the scheme. For a young kid, he made tremendous strides in those areas. Also, his adjustment was particularly strong considering the low amount of snaps he played. He supports the run better than any other CB we have, by far. He maintains good positioning. He contests balls well. To me, he looks like a guy ready to really play well as a sophomore. Remember, press corners all come into the NFL needing a lot of work. In Xavien Howard's case, he made very substantial progress in those areas.
McMillan was underrated IMHO. He is an instinctive LB with top notch athleticism, a workaholic attitude, natural leader, smart player, and an extension of the coaching staff on the field. IMHO, it's just a matter of time with this kid. He may not show as a great coverage LB right now, but rest assured he will work at it until he gets competent at it. Still, it's a lot to learn for a 20 year old entering the NFL. While I expect him to be the QB of the defense ... I'm not expecting it to happen by game 1. If I had to guess, I'd guess that McMillan starts out playing Sam (or Left LB if you believe Burke's explanation of our LB corps), and then moves into Mike in season 2 or in the event that Timmons gets injured.
I'd keep an eye out for Jakeem Grant having a breakout season as well. If he gets his hands under control, he offers a lot in the open field. His stop-start ability and change of direction are beyond elite. If he's reliable, the kid is going to make a lot of highlight reels.