It's probably gonna make me seem like scum lol but here it goes.
If the consensus among the veterans is that Banez isn't that great as scum, it could be a possibility that the scum decided to throw Banez under the bus with Poyser leading the way to get Banez lynched. That would get everyone to read Poyser as Town really early in the game and he'd pretty much have free reign on leading mislynches. One big thing that's stopping me from fully going in on that theory is that Kira was a really strong role and I doubt the scum would just throw it away like that.
Okay good to know, I like this post, looks like independent thought from a new player.
The conclusion you arrived at is correct as well, Poyser isn't the kind of player to throw a weak teammate under the bus literally from their first post, much less the Bus Driver GF, as that role is very useful to have. On the contrary, Poyser prides himself on being able to carry weaker players to a scum victory as their teammate. Or at least he used to but he's having a pretty shite year as far as scum performances go, still I don't think he'd stoop this low just to have a good scum game for once.
The other thing is that scum hard bussing each other d1 is still bad strategy. You may ask, why, isn't having one of your guys act as pseudo-confirmed town a huge advantage to have? The answer is yes, BUT it also makes them a prime target for the Serial Killer who is likely to take a shot on a basically unlynchable player eventually. The point is, Poyser knows all of this and so I don't see him hard bussing a teammate d1 at all.