I am going to be labeled a homer for saying this but I think that Crawford's ceiling, not current ability, is Chris Doleman who was developed under Marinelli in Minnesota during the 1980s. He was slow to develop in his first two years and then came out his third year.
The combination of speed and power is there; the skills using his hands and fluidity, bend and body control are not all in unison. However if he can put it all together then that is the type of player that I see. Quick, strong and size with the ability to move around from spot to spot. DE is a harder position to play unless you have truly elite quickness like a Barr or Mack and I expect that he will get better there as time goes by; it might not be this year.
Marinelli likes to move his guys around and I could see him down the line using Crawford like Doleman in moving around the line. I really do not buy the notion that he is exclusive to any position on the line.
I do love watching player development as it is the key to program success. We are doing well this year.