Honestly, my current favorite idea for the Windclan coup attempt by Mudclaw in my rewrite, is that it would have almost certainly worked if it wasn't for plain opportunism.
Like, Mudclaw's followers were loyal to him, he was a spry aggressive deputy to contrast Tallstar's more passive nature, and that earned him plenty of loyalty, particularly when he was fighting against Shadowclan tooth and claw when Windclan was getting expelled.
So by all right, the announcement that Tall changed his mind last second and made Onewhisker deputy (which was his own decision here, not Starclan's) in private and corroborated by only the Thunderclan leader, a coup should have been a cakewalk for Mud.
Walk into the leaders den, make Onewhisker say that he lied, and reclaim leadership. No one actually thinks fucking Onewhisker would be a good leader, so very limited opposition. Hell, Mud may not have even been planning on killing One, just chase him off the territory.
The only problem was, Onewhisker was related to quite a few cats. And those relatives realized that they were now not only related to the leader, but it was timid, yes-man, 'does what you say if you say it firm enough' Onewhisker. So when Mud goes and tries to question the story and intimidate One, he finds voices of opposition, Cats going to Onestar's defense, much firmer ones.
Basically, Mudclaw was defeated by the power of opportunism and promises of Cronyism/nepotism.
And also Thunderclan, no way in hell was Fire going to let this much of an opportunity just slip by.
Suffice to say, that imposter syndrome was hitting Onestar hard due to knowing just how he lived past that night.