I wrote a post today for Football Study Hall on the 4i-technique strongside DE you can read here. The upshot is that big SDEs that can battle with offensive tackles and vacillate between setting the edge and filling interior gaps are becoming prized tools in anti-spread, odd fronts.
Lots of Big 12 teams are after kids like this, yet a likely future stud like Andrew Fitzgerald is still not fully recognized for his potential value in the role. OU has somewhat miscast Charles Walker in this role, and he's doing real work there despite being more of a natural 3-technique. Texas will use Hassan Ridgeway in that role and the impact he's capable of is probably blunted somewhat as a result.
The guy who has some lateral quickness and 6'4" or better length is the ideal.
The game is always changing and it's hard to keep up if you don't watch lots of film of lots of different teams, which is why you read this site, no?