The only thing Byrd would be guaranteeing by faking an injury is a big dent in future salary. Hell, any kind of foot injury like this is probably going to put a dent in his future salary. There is very little logic supporting this hypothesis, and just a whole lot of this continued character assassination act that seems to be popular among some Bills fans.
Anyone who thinks otherwise is being highly speculative, and is frankly, nuts.
I understand where people are coming from, to an extent. He makes a lot of money, more than most of us combined, and it's easy to call him a baby and say he should just take what is offered and play for that amount. That is a very limited view of this situation, though.