Okay, let's go your route. Discount the playcalling. Now, once that is all said and done, you can blame Garrett for not reining in Romo for changing those plays. Either route you take brings you back to Garrett being the problem.
This is the only correct answer if the question is, "Will this year's defense be better than last year because of this coaching change?".
Kiffin taught Rod everything he knows. So, tell me how this defense is going to just magically going to flip a switch because of this coaching shuffle?
The words would be spelled bros in this instance. The "bro's" are not claiming possession or performing any action that would require this noun to be contracted.
And, no, not mad.