I can't imagine that EJ would miss the opening game...there are very few knee proceedures where you would miss 2-3 weeks...ACL/PCL are year- 6 months...MCL/LCL usually rest no surg, if it requires surgery then months of rehab not weeks..which leaves a scope to clean up cartalage or a loose body-week to two weeks out...possible an injection or having the knee drained -week or so...
I think the coaches know they have their starter and decided to get a small problem that EJ could have played with talken care of now rather than have it linger for the season...I think we wont even be able to notice that something was done come week one...(just the opinion of a PT...if there are any knee doc on the board with different thoughts fire away...)