If I remember correctly, the program that WDW used to bring over the international cast members had a time limit on how long they could work in the pavilions. Partially due to legal requirements around visas, and partially to ensure that the CMs working were "authentic". At the end of their program, some chose to transition into other roles outside the international program. This meant they were subject to whatever visa requirements a normal job had for non-American citizens/residents. I wouldn't be too surprised if the CMs who had made that transition were offered the ability to transition back to jobs at the pavilions for the near future.