I don't really like the term â€œalphaâ€ with respect to cats and here's why: when most people hear that term, they think of a rigid hierarchical social structure with one dominant individual, such as the pack in dog world. It's not usually that simple in cat world. There is dominance in cat social groups, and sometimes one individual is dominant all the time, but often dominance is very fluid and changes with time, location and situation.
For example, I have one cat who dominates vertical space, another cat who dominates the floor, another cat who dominates the furniture. One cat dominates my lap when I'm sitting on the recliner, another when I'm sitting at my computer. One cat dominates feeding time, another cat dominates the water fountains. One night one cat will dominate playtime, another night a different cat.
Another major difference is that in the pack social structure the alpha individual wins his dominance by right of contest, whereas in the cat world it's something more subtle. It seems to me it's often actually by consensus. Rocket didn't have to fight the other cats for his rights to my lap, they just seemed to give it to him. The terminology I like to use is that the subordinate cat "defers" to the other cat. Perhaps it's a matter of everybody getting along peacefully without the need to fight. It's well-know that cats prefer to avoid fights when they can.
Anyway, feline dominance an ever-changing landscape of social interaction. That's the way it is at coaster's house, to answer your question in a roundabout way. And it's really interesting and fun to watch.
This is all just my opinion, of course, and I hope itâ€™s appropriate here in response to your post instead of in IMO.