Here's the thing - DLR face character casting now oversees WDW face character casting, and DLR's casting directors have the authority in the equation. A few years ago when this change occurred, DLR's casting director flew to Florida and "disapproved" countless performers from various roles because he/she didn't feel they were correct for their parts - operational needs be damned.
A lot of WDWers were upset, obviously, but they've never been known for their spot-on face character casting, so the move was considered necessary from DLR's end when it comes to maintaining the brand.
I don't know the particulars of this situation, but it could have just been that the DLR casting directors found no one to approve for the role in WDW, so they ordered the expense as necessary. I'm not totally sure, but it looks like one of the Maleficents for this event was flown out from DLR as well based on some pics I've seen.