I guess I'm as foolish as Porter, but while I think Marisnick is a good center fielder, he's hardly exceptional. He is often slightly misjudging his routes and doing last minute twisting to glove it and I don't recall Fowler doing that. I also haven't noticed him covering any more ground than Fowler (Marisnick gets better jumps, but has less closing speed). He probably has a better arm although I have yet to see it. In other words, I don't see him as clearly superior to Fowler as a defender. I also don't think Fowler is a bad center fielder.