Banzu's 17, actually. He just looks older. And finding a half-decent non-white-non-black PB is hard enough as it is without being picky about age. Seriously, no one makes icons of middle eastern people it seems. He's also not the genius that Kazuichi is, he's just really talented.

He'd try and dampen down that tension somewhat if possible - referring people there if he couldn't help them and such - but only for the sake of making sure he has a good professional reputation, not because he actually cares if Dad-Souda likes him personally. He can be friendly but he's not interested in being friends with anyone. A one-sided relationship like that seems to be in line with a lot of Kazuichi's relationships, really. Banzu wouldn't push him away, but conversations would mostly have ended with the realization that Banzu didn't say anything new about himself and everything was just about business and technology.

Also unless it was under-the-table stuff it'd be known that his legal name is Varun Elmas. He doesn't use it unless he has to for a number of reasons.