Yeah none of it really matters. Vrabel is in charge.
Vrabel worked with Jon Robinson in Tennessee and set the vision of his roster. Robinson worked towards that, although hit issues eventually, with the biggest issue being the AJ Brown trade (which you may be able to blame on the owner for not wishing to pony up on a contract for). Robinson got fired, and Vrabel wanted to tab Cowden to replace him to have a continuance on the same roster-building vision. Owner said F that, I am hiring Ran Carthon and he's gonna follow his own vision. This led to a bad year and Vrabel took the fall. Then Carthon hired "his guy" in Callahan and it was an even worse season. Then Carthon got fired.
So, essentially it will be the same idea here with Cowden following that same vision which Vrabel wanted to follow in Tennessee, but Vrabel will have more control over things going on in the front office than he did there.
Wolf's role will be to work with Cowden to understand and help fulfill that vision. It does not really matter who is "over" who as neither is over Vrabel.