Did anyone see David Unwin's talk on putting the pteroid back into
the fossa of the preaxial carpal?
You misunderstand. The pteroid articulates with the proximal syncarpal
according to that talk. Unwin explicitly agreed with Bennett (who was
present) that the fovea contained the sesamoid A, but disagreed with his
opinion that the pteroid instead articulated with the proximal surface of
the preaxial carpal and showed good evidence from articulated specimens that
it actually articulates with the proximal syncarpal.