Why?

Thursday night, sixth inning of a tie game, two out, two on. Piniella pulls his starting pitcher (who has only thrown 82 pitches), trying to score a run and get the lead. I understand that strategy, but if you're going to pinch hit for the pitcher, why not use someone who can, you know, hit, instead of someone with a .182 BA who will weakly ground out to second base? When all you need is a base hit, anyone on the Cubs bench would have been a better option, including:

Sean Marshall (.231)
Rich Harden (.216)
Randy Wells (.200)

Oh - and one more: Tom Gorzelanny, the guy that Miles pinch-hit for (.222). Yes I know it's a small sample size, but could he have done any worse?