If Sammy isn't there, perhaps the game plans would have been different with the same results. You can say Sammy helped them win, but you can't say they wouldn't have won without him. Butterfly effect.
And big picture, even if they lost those games would they be better off long term, with a different young WR or TE, and the chance at another high 1st round pick to get a QB. They're not making the playoffs anyways. The "Sammy will make EJ better" experiment failed.