Come on...I'm going to call shenanigans on this. The fact that Roethlisberger "narrowly avoided a sack" speaks clearly to his pocket presence and ability as a quarterback. That's like saying Brett Favre wasn't a great QB, he was just really lucky to keep avoiding horrid sacks whenever plays broke down and he moved to find open targets.
Do the Steelers' count on that magical ability, or do they breathe a sigh of relief when it happens?
Circumstances unfolded extremely favorably. Roethlisberger didn't telekinetically trip Wistrom. His underhanded toss to Ward isn't something they practice regularly.
The Steelers utterly dominated the Colts and the Broncos -- no question about it. No luck involved -- they hit those teams in the mouth. They did the same to the Palmer-less Bengals in the second half of that game as well.
Against the Seahawks, they got lucky on several occasions. I don't know why that's so hard for Steeler fans to admit.