Big Dan is from my part of the world so I have always rooted for him. However, I watched him at camp a few seasons back and the very first thing I noticed is he does not get off the blocker left or right. In other words, he just isn't suited to playing 2 gaps like a 3-4 DL is often asked to do. I think he would be better in a 4-3 as a tilted NT to crash the Center and plug the A gap. As big as he is, he very likely draws a Double team (at least initially) from the OG.
I am still rooting for the guy, but ever since I saw him in camp I knew his limited lateral movement would be a liability for him. I think Suggs is going to take his spot if it comes down to those two.