Just taking a guess - but potentially the two young males at the Wilds. Unless Granby are importing from overseas, they seem the most logical option.
This is what I'm assuming as well, given the limited options.
It is even more of a shame they let them then simply die out when the One Plan Approach to species conservation requires the global zoo community to work to a global management of threatened species. If AZA is phasing out they should enable other regions to integrate amd absorb that current small US dhole population into their regional breeding program.
They aren't letting them "simply die out". There's a reason for it.