It's been openly acknowledged by the Hawks organization and openly reported by the media, that all the major players in the Blackhawks management have a voice at the table.
Who gets final say on what generally follows the traditional hierarchy, but McD, Bowman (and his consultants), Q (and his coaching staff) all have say and all have influence.
Bowman, as GM, will obviously ultimately wear all the player moves made on his watch, but it's asinine to suggest that McD and Q didn't have significant influence through both voice (to Stan and to each other) and in action.
There's been plenty of smoke that McD's fixation on 'continuity' and his obsession with ensuring the Blackhawks are seen as a team that treats players well have had an impact on contracts. And we know Stan isn't going to just hold onto players that his coach refuses to play, cause he'd rather have assets that the team can/will use than a guy sitting on the bench wasting a roster spot.