HUH? You clearly don't know what you are talking about. Mankins wasn't the sole cause of the losses in SB42, the play-off game against the Jets in 2010 or the Safety in SB 46. You are clearly talking like someone who is absolutely clueless about football for you to believe that.
1) SB 42 was lost when Mike Carey refused to call Eli Manning down even though he was in the grasp of two Patriots. Carey even said, after the game, he blew the call. You could also point directly to Asante Samuel who dropped an interception blew the coverage on 2 of the TDs AND the pass to David Tyree. BTW, the entire OL had the flu, yet the starters still went out there and played.
2) Claiming that Mankins was responsible for that safety shows that you didn't even watch the game. Let's review. The Patriots had Solder in as a receiver eligible and he was lined up at the Left TE spot to the left of Light. The you had Light, Mankins, Connolly, Waters, Vollmer, and Gronkowski. The Giants from left to right had Osi Uminyora, #99 (Tollefson ?), Linval Joseph, and Tuck. So, Tuck was lined up against VOLLMER to begin with. At the snap, Light is squared up to take on Uminyora with Solder. Mankins is squared up on #99.#99 disrupts things by engaging LIGHT and getting Mankins turned towards the outside. Doing this gets Light off-balance, forcing Solder to take Uminyora alone. Connolly turns and engages Joseph who is trying to penetrate against Waters. Joseph gets Waters turning towards the outside. Tuck, initially engages Vollmer, but then stunts around Joseph. Connolly disengages from Joseph and swivels to try and face up with Tuck, but Vollmer is in front of him. BJGE, who is supposed to be blocking and picking up any stunts, runs through the B gap and ends up chipping Uminyora while Light is engaging #99. Vollmer tries to move with Tuck, but can't. Connolly misses the block on Tuck and ends up hitting #99. Connolly is now in Vollmer's way, delaying Vollmer from getting to Tuck. Tuck then swivels around to his left, finds Brady and rushes him.
Now, I don't know how you can be blaming MANKINS when it's clear as day that it is at least Vollmer and Connolly who screwed the pooch on the play. It is my belief that BJGE was also supposed to be pass-blocking, not running delayed route out through the B-Gap.
Safety first for the Giants - NFL Videos