Per a source with knowledge of the league’s position on the matter, the NFL would contend (and likely will contend, if Newton follows through on his vow to speak to Commissioner Roger Goodell) that, as missed roughing calls go, he’s faring better than plenty of quarterbacks.
From the league’s perspective, the officials have missed three roughing calls on Cam since the start of the 2013 season. (Yes, that seems low.) Eleven other quarterbacks, by the league’s count, have had more missed roughing calls: Jay Cutler, Alex Smith, Geno Smith, Josh McCown, Andrew Luck, Matt Ryan, Kirk Cousins, Joe Flacco, Ben Roethlisberger, Case Keenum, and Ryan Tannehill.