Guy already got paid in his rookie contract. Very lucky he came in when he did. As long as we are on the topic of 3's here are my 3 scenarios.
1. Negotiate a team friendly contract and sign him
2. Find a replacement at either LT or RT and make the move, but do not pull a Brandon Marshall.
3. Tag him. While it is not a friendly move for next years cap it won't be an issue in the future and you can make a move to tighten up the position for the future and get a lot of protection for the young QB. I really think that it would be unwise with the way the current roster sits to go through every dime of cap space in this offseason. So the 15 million would just be something that comes off the books at provides space for offseason 2014.