Between Bern and Costa you should have a starting OC. Right Guard will need to be addressed but is a far lesser priority than RT which is probably the 1st or 2nd priority depending upon what happens with Spencer. Would be very, very nice to have Bern as your Interior Swing OL and Parnell as your 3rd OT. I'd brign Cook back as my 8th OL and last active OL weekly. Hopefully he could play some TE on goal line and short yardage. Dallas is about two solid OL away from being sound there. But even then they need to get some breaks with health. They can't have 4 or 5 guys go down by mid-season. Another good draft and free agency year will go a long way. But they absolutely have to get better injury results than this year.