Everything I am hearing is that scouts are coming out to practice in droves (significantly more than last year), and they are there to only look at him. To the point where when he isn't practicing, they go and talk to Stroud/Marcus and then leave. It's not that I think he was a guaranteed 1st round pick before the injury, although I do think he will put up 1st round measurables if healthy. There is a picture floating around online of him as an 18 year old at OSU, and his measurables even at that age are off the charts - and better than a lot of guys getting drafted in the top 3 rounds. I'll see if I can find it and will post here.
I guess what I am saying is I think unless something crazy happens (off-the field, unsuccessful surgery, etc.), he is a guarantee to go in the top 3-4 rounds with or without this injury. If he had played this whole season hurt, required surgery after the year, and was unable to participate in the Combine/Pro Day with teams knowing he was pending surgery, that would be a different story. I just can't see him not blowing away the Combine and a team not getting enamored with his physical abilities.
Chuck Smith (who a lot of NFL people consider the best pass rush coach in the world), went on ESPN radio last week and was asked "Who are the next-generation pass rushers?" He mentioned 3 guys - Arden Key (LSU), Charles Harris (Mizzou), and Jamal Marcus.
EDIT: Okay, I found the picture. Again, this is before his sophomore year at OSU when he was 18 years old (and this is clearly official OSU documentation). Take a look at the 10 yard split. Now I am not going to get into the whole "was it hand or laser timed?" question, because it is beside the point and we have no way of knowing anyway. However for a little context, Von Miller's split at the Combine was a 1.57, and he was obviously Combine-prepped and a few years older than Marcus when he had the 1.47. Then you look at the 28 bench press reps (with Miller putting up 21) and the picture starts to get a little more clear about the type of athlete we are talking about here. I am in NO WAY saying Marcus is on Miller's level or will ever be, but I think NFL scouts/coaches will look at his measurables and think, "Man, if you give me a few years with this kid, the opportunities are endless." I believe Marcus is now a legit 6'2 250 as well.