Greenway is best suited to be a 4-3 weak side linebacker. He's a chase and pursue guy, not a stack and shed LB. The comparisons to DJ are on the mark.....except Greenway isn't as athletic or explosive. DJ minus the big plays.
Reasons why I don't think he is a good 3-4 OLB? First, Dallas is looking for a strong side guy. Greenway was weak side at Iowa and doesn't have experience playing over the TE. I don't know how anyone can call him an excellent blitzer considering he rarely did it. Peter King wants to rave about his 2 sacks in a game....well, those were the only two he got all year.
If anyone saw him at the Combine weigh ins, he lacked definition. He looked like a boy among men compared to Hawk and Sims. His bench and speed numbers were sub par as well.
Ferentz is a great coach, I'll agree with that. However, I think he has his guys so well prepared that they grade out higher than their actual abilities. Look at recent high round Iowa draft picks. Gallery, Clark, Sanders, Roth, Steinbach....none have really performed to their draft status.
Greenway is good in coverage, but he is the type of guy that'll avoid a block rather than take one on. Used to a scheme where the lineman keep blockers off him so he (and Hodge) can run to the ball and make tackles.
He'll probably be an alright pro, but if I am running a 3-4, this isn't what I am looking for.