I think on the M4 project he had to focus on the entire song, there are a lot guitar tracks on each song, plus vocals, plus writing everything.In Alter Bridge Mark had done alot of that work already, and in the future they will share the burden. I think there will be less presure and he can focus on his part more since its actually smaller.I always thought he should have done solos on Second Skin because he can really tear it up, but that wasnt the in thing at the time. Its starting to come back wich is very cool! I love what Mark did guitar wise on this cd!