Heyer, Locklear, and Rinehart where the main ones I remember.I suppose it depends on how far you want to go back, and how one would define "so many", but some examples (in addition to Rinehart) might be:Still don't recall "so many" linemen the Skins have cut they have become starters for other teams but I could be wrong.
Derrick Dockery left to start in Buffalo, and came back, and then left again (to Dallas, with only a handful of starts in his last couple of seasons).
Tony Pashos was signed last (?) offseason then was cut, picked up by the Raiders and started. Stephon Heyer also got cut and went to the Raiders (a few years ago), but started sparingly.
A worn out Jon Jansen was signed by the Lions and ended up starting a couple of games.
Sean Locklear passed through here with a few starts (for suspended Trent Williams) then went to get some starts for the Giants.
Willie Smith also got some starts here while Williams was suspended, then went to Oakland to start. Looks like he is now Rinehart's backup.
Edwin Williams was a UDFA we signed in '09, cut in '10 and proceeded to get some starts in Chicago over the next few years.
Those are most of the ones I could quickly look up through PFR and/or remember. I feel like there were some other FAs and/or draft picks that never started for the 'Skins but got some PT going elsewhere (like Pashos).
I never claimed they were good starters. I was trying to show how scarce good linemen are and that these guys can get jobs and starts in the NFL.