It's a shithouse tactic, but I'd imagine most managers would use it if it could force an earlier move for the player they've signed on a PCA. Because of that, though, if a player is signed on a PCA to a team in the same league, it would make sense, and be fairer, that the PCA must be withheld from the public until the end of the season. However, I don't know enough about these things, although I remember Alexander being publicly annoyed about it when Watt signed a PCA with Dundee Utd.