You are missing the point. Perhaps you didn't read the original post carefully enough.
I agreed to that gig when he asked me, because I did not play upright. It was portrayed as a one-off thing -- special circumstances. But now, he is actively promoting the band, doing music festivals, with a professional video -- clearly his intentions went beyond merely filling that gig on that one night due to instrumentation limitations on my part.
Actively promoting a band that plays the same kind of music, and cutting me out of gigs that do not require upright -- THAT I have a problem with. And by the way, I know that clients don't seem to care if the bass is electric or upright in this town. With tons and tons of clients, as the gig booker, it is never an issue. So i don't buy the argument that he needs a separate ongoing band simply because I don't do upright.
I think he is being unwise from a business perspective, and after reflecting here, I think he deserves to be moved to a second or third call position, essentially gutting his schedule, and I should move up one of the other loyal drummers. The rest of the group should know that has happened as a deterrent from forming direct competition with what I do, and to work toward the success of the band we have formed together.
In the last year, be brough me ONE paid gig, and I got him abotu 15. I also have him scheduled for a ton more gigs between now and June. He doesn't deserve the work if he isn't going to reciprocate. It's not right. There are a ton of musicians in this town that want to be part of the groups I have formed. It's time he took a back seat.
I'm surprised this answer didn't come up sooner. He clearly (according to the post anyway) said that the gig required an upright player. If you don't play upright, you don't get the call. That isn't unreasonable in any way I can see.