I've shown statistics that describe what he's done. You're the one who says "because I say so."
In the Rams comeback, he's under pressure at least twice, and actually has to scramble once. In Game 16 against the Giants at 15-0, he scrambles before hitting Moss deep for a TD to put them up for good. He was constantly under pressure against the Giants in the Super Bowl, so I assume when he led his team to the go-ahead score with 1:40 to go, he made plays under pressure.
The 2 plays you describe QBs making big passes under pressure (Eli to Tyree and Ben) are terrible examples. Eli threw up what was basically a 30 yard hail mary to Tyree. Ben threw a pass he didn't want to throw.
Can you name the great pass, in the clutch, under pressure, that Aaron Rodgers has made? Peyton Manning has made? It's not as simple as you think.