To be honest, although I’ve only seen a little bit of Castle, I like the idea of him as a creator on the wing with another PG in the fold. Sort of a better shooting Daniel Hamilton, who can attack a broken down defense rather than always be the guy doing the breaking down. Or to borrow from the other board, Paige Bueckers is a natural point guard, but played the wing when healthy and Nika Muhl handled PG duties and it made them a little less predictable. She could also look to score without it bogging down the offense.
But I could be wrong, and Castle might simply be better suited as the clear point guard.