Not quite sure about the guy writing the article. I seriously doubt that Cam Thomas is going to be the starting NT or even contend there. I think he was brought in to play end and be a NT in a pinch. I do not have the high hopes for him. I do like Tuitt. I also like some of the lesser known guys to be bigger than expected (Arnfelt and others). So, I like the line, especially what they did with the edges (Tuitt and Heyward).
Jones should be better this year. Not sure why he tabs him as a LOLB since Worilds is much better on the left than the right, but that falls under sloppy writing. I also wonder how Timmons will fit sliding over and being the man. Probably see some growing pains for a little while with this group of linebackers, but they have made the youth push, which was needed.
I do like Mitchell a ton, not so sure he takes Troy's role as the playmaker, more like a faster Clark, but a faster Clark is really good if you have a healthy Troy. Corner is still iffy, but a pass rush and better safeties can help the corners a ton.
I would not put great expectations on this group. They will need some time to settle in and grow. Defense will likely be better in the future, even with the departure of Taylor and Polamalu, not because they were not great players, but because the supporting cast will have improved over what they had last season.