On the one way, I'm ok with what you said : all species are agressive at a same level, but the differences appears claerly when you look at the damages caused by the fights. brichardi causes letal damages like Petrochromis in a few minutes. T. moorii have smaler mouth, the damages are smaler too.
To be more precise : for me T. sp. Mpimbwe are more difficult again than brichardi.
But sure! You know certainly people who haven't any problem with sp. Mpimbwe and the same have never could maintain sp. black for more than six months...