Yeah, seriously looking at his playoff numbers are pretty much identical to his career numbers, and if anything if you look at the range of seasons he made the playoffs and then pulled his regular season numbers from that exact range (basically excluded the Minnesota years) his playoff numbers are actually slightly worse than his regular season numbers.
But the couple years that Boston won, Ortiz had big numbers so there is your random narrative. He also had poor postseasons in other years where Boston didn't do anything.
It's a chicken/egg thing. If a team goes on a postseason run, it is usually because some players are having big postseasons in the super small sample. That doesn't make said player expertly clutch. It's a small sample, nothing more.
I mean, look at this amazing clutch postseason numbers for David Ortiz!!!!
Fooled by randomness yet again!