I haven't seen it on a guy who uses his speed/ runs into the box yet.
It's a very common injury for running backs and wide receivers in the NFL and a few good articles and some medical research papers on the recovery rate of these athletes (that all rely on speed and power). Not all lose their speed and power, but the most reliable paper that I read suggested that about half of players with full ACL rupture will lose speed and power - this was over a 3 year monitoring period.
The likelihood is that Jay will be slower and less powerful when he comes back, though this is by no means a definite. I have worked for a while with an elite age group triathlete who has had ACL reconstruction, who has remarkable run speed and continues to get stronger and faster. Admittedly this is for an endurance athlete and not a sprinter though.
