Though not mentioned the biggest reason for lower sacks and Ben's recent health has as much to do with the improved offensive line play as anything else.
It all starts in the trenches.
"With love, with patience, and with Faith
....She'll make her way" ~ Natalie Merchant
A better coordinator results in.
A better offense that is designed to get rid of the ball quickly.
A better offensive line.
Which makes everything else better.
Hard to say. He still took some hard shots that _could_ have taken him out, so it could still happen. It's a combination of everything, including luck.
Lest we forget:
He's strong to the finach!
"With love, with patience, and with Faith
....She'll make her way" ~ Natalie Merchant
In his HoF speech you'd better believe after the typical parents and school thank-yous he's going to give a shout out to Mike Munchak for extending his career. #YouDaRealMVP