At one time, RDE was the speed rusher, weighing between 245 and 265 while the LDE was the run stopper weighing between 270 and 290. The idea was that you want the faster guy coming from the QB's blindside. But I think Marinelli has been moving away from that rule in favor of guys who have both the size and athleticism to play any position along the front four. That way he can doctor his alignment to create mismatches dependent on the offensive line he is facing in a given week. If you consider that the only true RDE he has likely will never play football again (Randall Gregory), along with the move to take Taco over Watt, that would be the only logical explanation. I have suspected this for some time, but was told repeatedly the Cowboys would be looking for a RDE, given the old specs, so I didn't do as much research on Taco. Following the draft, though, I found some very encouraging info on Taco's athleticism, beyond the 40, which really isn't a fair indicator of a DL's speed...or at least not until QBs drop 40 yards prior to setting up to pass. Given my belief, I think the Cowboys are planning on eventually moving Taco around to see where he fits best, but he does have the bend and short area quickness to play RDE and simultaneously has the size to not be a liability against the run.