Ok, so I had to remove the latest crower (#3 of 12) and the next one started trying out a strangled attempt at a crow in the coop that very night.
I've got this crazy idea that the problem is that I have only sebrights plus one white bird who's even smaller. This, in combination with their talky, chippy (perfect descriptor, Uzi) nature and the absence of Roos is generating this crowing pattern. I have different kinds of chicks ordered for spring but it will be months before there's any hope of them taking over leadership of the flock. So I thought I might try to find a pair of bigger bantam hens to introduce to the flock now and try to take alpha away from the sebrights. What do you think? I'm worried about what I might be bringing in with a couple adults from a different farm and flock, maybe this is just asking for more trouble?
This is just so frustrating. I've also been reading the threads about the no-crow collars, maybe I'll try one of those on the next one.....
I used to like watching ice hockey & that's how my dad would describe players that weren't outright fighting but just on the edge.

When Odysseus started treating me like his large hen, I was kind of in a scramble to get him some actual hens before the weather turned fully into winter. So, I ended up with 4 regular sized Polish pullets. I was worried they'd turn on him since he was so much smaller then (he must have been a pound at the most when he landed with me). But they got on on great. Whether that was dumb luck, the cold snap that hit the night I brought the ladies home, their easygoing disposition, or a combo, I'm not sure. I'm only 2 months into my second year with chickens, so maybe someone with more knowledge has a better answer?