And that is "Cheech" Williams and "Chong" Davis are one strike away from sitting for a year.
If anything, this puts emphasis on drafting an additional tackle who can play LT and an additional receiving threat.
I would suggest moving back in the draft and maybe out of the 1st round altogether and try and address needs with 2nd and 3rd round picks.
Using the draft chart with pick values. The Skins could trade out of the #6 pick (worth 1600) and get the following: A late 1st round pick (~600), an early 2nd (~500), a late 2nd (~300) and a couple of 3rd rounders (~100 a piece).
So the 6th pick would net 5 picks in the first 3 rounds. This would allow diversification of risk on players getting injured, being stupid or turning out to be bad players.
With those 5 picks, take a WR, OT, OG, QB and a CB.
In terms of drafting QB's, you can find decent QB's in the 3rd round. Case Keenum, Dan Persa, Kirk Cousins are guys who can slip into the 2nd and 3rd round. One guy I like a lot is G.J. Kinne from Tulsa. He easily could slide to the 3rd round.
Another guy to consider with the Coby Fleener (TE from Stanford). He's an excellent and huge receiver in the mold of Rob Gronkowski.