According to Five Ounces of Pain King Mo has a torn ACL and will have surgery done next week. King Mo expects 3 months until he recovers from the surgery. Hopefully we see him back in a big fight on SENGOKU’s August event.

I didn't get it from them I got it from Nightmare of Battle

I think Mo should just take his time and rehab.  There is no reason to risk reinjuring his ACL potentially catastrophically this time and having an extended absence.