He is set in his way: he almost never practices by himself or to a metronome. In fact, I don't think he ever practiced by himself.
Imagine how crappy a whole band of people like that would sound?
So does my dog.
Face it, He's a narcissist and only thinks about himself and needs his brother's support to remain in the band. Obviously they are aware of the problem but choose to ignore it because they think they have power and control (rehearsal space, etc.)
As I said, his playing during shows is impeccable (most of the time)
Is the guy on drugs or something?
So at rehearsal (in private) it seems that playing drums the way he does is some kind of anxiety reduction technique. He pounds away as loud as possible, not concentrating on the music, loosing time, funky fills, etc. ***?
Yet, at gigs(in public), when strangers are listening/watching, he changes his behavior and conforms his playing so he won't make (or a least reduces) mistakes and so he won't "look" stupid. His probably like that in his non-band life? Does he have on-going problems that never seem to get resolved?
IME, the serious deviation between private and public behavior indicates some serious emotional issues. His brother knows it and protects his position in the band. No other band would have him just by himself.
I like the idea of video taping a rehearsal and reviewing it. Don't expect anything by resistance and defensiveness. The guy is stuck in his ways.
Given that, I would still lay it all out just on the off chance the guitar player can talk some sense into his brother.
If you stick with the band, put up some double thick sound board around the drums and it will reduce the volume substantially, maybe enough to make the rehearsals livable.
