All three have played about as well as possible in the preseason, but preseason success is not a good indicator of regular season success. The Bills still have:
1. A young QB that showed some potential as a rookie then was benched year 2
2. A young QB with great athleticism, below average height, a poor college career completion % and almost no NFL playing experience
3. A journeyman who had 2 very good seasons out of 10, but otherwise has thrown more career INTS than TDs
I am cautiously optimistic that what we are seeing is that Taylor has improved since college and is making good on a golden opportunity and that EJ Manuel is showing genuine improvement, but I wouldn't bet the mortgage money on that based on preseason results.