After reading [this answer][1] that a restricted airport caused a strange cutout in Class B, I am wondering if it possible that there are multiple airfields in the same airspace?

If yes, then:

 - Which ATC has most authority
 - How congestion is handled?

Please note that I am not talking about an airport which is under an outer circular shelf of a Class B or C airport.

  [1]: https://aviation.stackexchange.com/a/11541/65