> but I still think the developers of both engines banter over who is really producing the True WDL numbers for a given position
In fact, stockfish's WDL is very rudimentary: it is a function of the centipawn evaluation of the position and the value of the remaining material.
See https://github.com/official-stockfish/Stockfish/blob/a6d055d...
Yeah, it's still unclear to me why Stockfish produces WDL numbers beyond sometimes people ask for them.