After throwing a touchdown pass in 56 consecutive starts stretching from November 2010 through November 2014, Manning has been kept out of the end zone in nine of his last 18 games.
"It wasn't his arm. It was just his foot," Sanders stressed on Thursday. "Peyton's arm has always been good to me, in my eyes. He's never had a really, really strong arm. He's always been the guy that before you come out of your breaks, the ball is there."
In fact, Sanders believes Manning is healthier in the lead-up to Super Bowl 50 than he has been all season.
"I can tell he's healthy because he's running around, he has more bounce to him in his step," Sanders added. "And hopefully it shows in the Super Bowl. ... Like I said, it wasn't his arm. It was his foot."
Manning's waning arm strength has been an issue ever since his 2011 neck surgeries. It was nearly three years ago that he first quipped, "I throw a lot of wobbly passes ... a lot of wobbly touchdowns, too."
Where they differ, per Rapoport, is in the belief that Manning can't throw the ball like he did a couple of years ago. In fact, they believe he can't even throw like he did early this season -- when his arm was still the NFL's biggest mystery.
Will we see the rejuvenated Manning who marched down the field on the opening possession of the AFC Championship Game, or the limited version who failed to move the offense for the final three quarters of that Denver victory?
We'll have to wait until Sunday evening to answer that question with authority.