I am completely baffled why anyone thinks this. McDermott hasn't really said anything other than we'll do what's best for the team. And why would he or anyone expect the Steelers to win the next 2 games after the way they've played for the last month?
We'll see on Sunday, but I'd bet good money that Allen and Diggs at minimum will not play longer than a quarter (my gut tells me they might play one drive or less.)