1. Pros from other organization doesnīt matter the IFBB....but to compete in IFBB Pro Shows those Athletes need an IFBB Starter Lizens and they have to qualify as all other Amateurs to get htere IFBB Procard.
2. in the case of Mabrouk/Egypt (several time IFBB World Champion) it was not against the IFBB rules, "cause" IFBB Pros are allowed
to go back to the Amateurs (losing there Procard), but canīt get a new Procard after this (Re-Amateurs, i remember Hamdullah Aykutlug who did the same, after he recognized that he wonīt be a top-Pro....).