Borland just quit? Fits right in about this being a 49er problem. Willis? Tell me did you or any other 49er predict this would happen? Let me save you the time, no not even. Nobody saw this coming. Yeah, yeah, I know he had some issues, but retire? Nope, didn't see that coming at all and neither did you.After 5 years of play? Yeah it is. And it is only a 49er thing? what other 49er retired early from injury? Patrick Willis? Nope, he played a long time
Justin Smith? Nope he played a really long time
Borland? Nope. He flat out quit. Didn't get injured.
Worilds played the same amount of years as Davis. He retired as well. Jake Locker just retired and played less years. Jonathan Franklin retired after one season due to injury. It happens all the time
Davis said he will come back in a year or two. He got a severe concussion and it might be still effecting him.