It had to be MLF taking a stronger hand in the D. I can't see Barry changing his passive playcalling any other way. I wonder if MLF told Barry that the last weeks of the season are his audition for another job, and if Cardinal was right, he may even have been telling Barry what he wanted or what he was seeing on the field. In addition, someone had to step up to bring Campbell and Jaire back to the table because Campbell said he was done. Love? Jones? MLF? Who knows?
But I am also guessing that today MLF is a bit pissed that he had to bring his starters back on both sides of the ball. That's embarrassing when you have that big of a lead late in the fourth. Yes, MLF might have pulled them early, but with that score at six minutes you'd expect to be safe. If you leave a starter in and he gets hurt... well, danged if you do; and with Barry as your DC, danged if you don't.