Nah, Breida got another carry pretty quickly after his fumble. It really surprised me at the time. And he was in there for a handful of passing downs as well.
With regard to the McKenzie thing, who knows what's happening behind the scenes at practice that has caused McDermott to lose faith in McKenzie. Maybe it's performance related or something else. And I have no problem with McDermott's answer. He just told the reporter the truth.
And yes, I thought McDermott coached a terrible game last night (the challenge, taking wind in the 3rd, wasting other TOs, not going for 2, kicking the FG on the penultimate Bills possession). He really felt the weight of the game last night and it showed.