Dombrowski was no more than a salaried employee. Of course he would be involved in discussions, but when you're talking about one of the best players in history in his prime, that comes down to an ownership decision on how much they're willing to pay, Ownership drew the line at around $300 million and wouldn't budge from that, and then gave the go-ahead to trade him.
I blame Dombrowski as much as I blame Bloom, which is to say zero and zero.