Definitely my opinion would be that Son and Rumba are two different claves
I would also consider 6/8 clave a third one ... I can see how that could be debated though. Also isn't there a Brazilian or Bossa clave?
Are you familiar with "The Clave Matrix", by David Penalosa? He was [maybe still is] a member. I have it but haven't gotten into it yet ... too intimidating
![Smile :)](./images/smilies/icon_smile.gif)
If you like deep clave theory discussions go through David's past posts ... heavy and often over my head, but like I said deep thoughts when it comes to clave.