I don't think our 2nd string QB is on the roster yet. Whaley had to sign who he could over the weekend. Tuel, Leinart and Lewis are in the interesting position of playing for the opening day starter/3rd string spot.
A lot of QBs will be available in 6 days. My guess is Whaley signs whoever is cut between Brady Quinn and Tarvaris Jackson. Jackson might even be able to start week 1 with knowledge of the offense. I'm guessing the Giants would also like to sneak Ryan Nassib onto the practice squad, but know the Bills would sign him if they tried.
Having said all that, EJ is obviously the starter when he is healthy, Kolb is probably headed to IR, 2nd string will be acquired next week and 3rd string/opening day starter will be decided in practice and during the game on Thursday. If Tuel losses out to Leinart or Lewis in the next few days, he probably makes the practice squad. For all of the positive talk about Tuel, his performance on Saturday was less than stellar.