I would talk to a doctor if you could, especially one that deals with sports injuries. I tore mine pretty bad (couldnt sleep due to pain, even with painkillers) and I had to do various stretches to...
They're talking about moving your grip a few inches, not going very wide or very narrow (CG bench). The change is supposed to help you gain a little strength, not size.
Endurance is much more important than pure strength when it comes to MMA. You can be as strong as you want but if you run out of breath in the fight its pretty worthless.
Building up some muscle will make you look better than losing some fat. I'd suggest you read up on proper diet and nutrition and start lifting weights. You can do cardio as well if you want to get...
Listen dude, life is all about balance. Guess what, its possible to juggle training and having a social life. You might not be able to train as "hardcore"...