I suspect (and I know you agree with me) that AVB was intelligent enough to understand that as well.
Didn't prevent him saying he wasn't properly backed and that he never got the players he wanted after he resigned. It's not that much of a stretch to assume that such things won't be laid out publically until they become breaking points in the coach-chairman relationship (perhaps after a run of poor results), and that Poch's gruelling pre-seasons mean that getting a player in early may be as important to him as getting the right players in was to AVB.
All speculation, of course (save for AVB's public statements, those are a matter of public record), but the longer we delay, the less time Janssen has to spend in our pre-season regime, which means more time spent acclimatizing while the season gets underway and the more likely it is that we're forced to play an exhausted Harry again after affording him just a few weeks' worth of vacation.
Poch has said that he prefers his signings to have a full pre-season with the rest of the squad. Janssen has said that he much prefers to have a full pre-season with the rest of his team-mates, which is why he wants the transfer done swiftly. So, the people holding up the deal are ourselves and AZ - can't even argue that the player's waiting on a better offer or something, because it's clearly all done with him.
This needs to be done soon, or it becomes somewhat hard to see it as anything other than backsliding into being cheap for the sake of being cheap, backing the manager be damned. Hopefully the next few days (maybe even the next 24 hours) bring closure in this regard.