firstly, that's a single example with Roberts -- secondly, while I don't know that he actually DID so, at least Roberts COULD bat and COULD field (in the sense that he wasn't physically unable to -- it sounds like Gardner can't be expected to do ANYTHING else but pinchrun) -- thirdly, Gardner is fast, but he's NOT a real good basestealer -- he's NOT "instinctive" and doesn't just GO on first move/first pitch, instead he spends too much time trying to "read" the pitcher -- finally, Roberts wasn't coming off of forever on the DL
to bring Gardner aboard for just a pinch-run in the post-season IS a wasted roster spot