I second that emotion.
Genius. Yes, no doubt that word describes Brian. If not him, then no one.
I third it. Brian is eccentric and has mental health issues very likely exacerbated by drug use, but in terms of the sheer ability to compose and arrange music, the man was (is?) an incredible talent without peer. To listen to the session tapes from say the “I Get Around” era in 1964 through Pet Sounds and Smile in 1966-67 is to hear someone who was operating on a higher plane of ability than everyone else.
And this is not a fan fantasy. In the “Wrecking Crew” documentary from a few years back, you hear the same thing from the top studio musicians of L.A. of the ‘60s and ‘70s, the people who worked with everyone and played on 80% of the pop and jazz records and all the TV & movie soundtracks. People like Leon Russell, a musical genius in his own right, saying things like “Brian was a stone cold genius. It doesn’t get better than him.”