WiFi6 / OFDMA / and MESH - how's it work?

Kinda randomly picked this section to post in, but I can't find info on this elsewhere (google) and I may just be asking the question wrong.

I'm looking specifically at WiFi6 and OFDMA and any sort of MESH. WDS style, or 802.11s, etc. Basically to stack batman-adv on top of.

OFDMA has the AP scheduling tx for AP and STA. But if two APs are talking to each other via WDS/802.11s, which one sets the scheduler? Expand that out to 3+ units.

Basically, what keeps OFDMA intact in a mesh?