Yeah, my only concern with that is they don't want to use a click and want to record everybody live in the same room. He's a good enough guitar player to do that though. When most people do that do they use the same amp/pickup settings and layer or do they use diff guitars/setups? From what I've read in interviews people have said they've done both. We are totally self taught recording/mixing so we know a lot about some stuff and next to nothing about things that are probably really obvious to someone w/ experience. Personally I'm 100% pro click and solo track recording after seeing how much easier and faster it is on my solo stuff and my few studio trips.
Im the kind of guy that prefers more raw music. So i prefer live recordings with good micing and mixing. He should be able to account for any dragging or rushing playing to the mix.
It depends on your goals. You can get a more dense sound using a different guitar and amp. Or even the same amp with a different dirt pedal. If you use the same aml and guitar it will make it thicker but may not sound as dense. You just have to try and see what works for your sound goals.

