Tyrann Mathieu tweets, deletes Sherman contract commentary

He’s still rehabbing from his knee injury, but Cardinals safety Tyrann Mathieu can backpedal. In the moments after Richard Sherman’s $57.4 million mega-deal with the Seahawks, Mathieu wondered aloud what teammate Patrick Peterson might be worth. “Oh boy, I wonder what @RealPeterson21 worth is… 60-70 million??,” Mathieu tweeted. Sadly, he quickly deleted the tweet, and…