It's outside my area of expertise. But lateral meniscus "damage" isn't a medically descriptive diagnosis. "Full tears" are usually repair arthroscopically. He doesn't seem to have that since he's not having a procedure. A grade 1 or 2 injury might be amenable to rest/ice/PT etc. I assume they would just follow his symptoms in that case to judge when he comes back. Maybe repeat the MRI.
If he's still pushing for OBJ to the Bills, maybe he just wants a buddy to be on IR with him!