Interesting thought. It very well may have had a little something to do with it, but hopefully he will be fine and make it through the season without another one. I don't remember who KC replaced him with(will have to look it up), but maybe they were just wanting to move on to a younger player who won't cost them as much.
Don't really know their cap situation but the amount Morse is getting/or what he would have commanded from them may have had something to do with it as well. But yes, I agree it's very easy to get another concussion so maybe the Bills are playing it safe and resting him up real good IDK