Aaahhh - I feel your pain!
I had a Welsumer and a Buff Brahma cockerel- the Welsumer on purpose, the Brahma was supposed to be a pullet.
The Welsumer was dominant, crowing, mating - he always let the pullets eat the treats... But: he would attack me!
The Brahma roo was respectful of me, but behaved more like a pullet. Later, when he matured he started crowing and mating, but the Welsumer wouldn't let him do much of either - the pullets weren't keen on him either.
I gave away the Welsumer, (at about 8 months) hoping the Brahma would step up, win the hearts of the pullets and stay respectful of me. The flock was much calmer - I hadn't even realized how bad the tension between the 2 roos had been!
Well, my Brahma did not turn aggressive, but half the hens never warmed to him and he overmated almost all of them to the point where all but 3 had bare backs.
He never danced or tidbitted, either (and he had a crow like an old car horn, - our Welsumer had sounded much more melodic!)
A few months later, when I got tired of looking at naked backed chickens I gave away my Brahma.
I am now raising a new cockerel (he's 13 weeks now and just started crowing) - hoping I might have better luck this time...
All that to say: It is really hard to predict developing temperament and flock dynamics. Issues you aren't even thinking of now might become deal brakers. Likely with a small flock things are calmernwith just one roo. Your Brahma sounds great. I hope he'll work out!