Re: nene/kmart/bird-who defends pf's best?
It really depends on the matchup. Kenyon (when healthy) is obviously more mobile and better able to match up against shooting power forwards like Dirk, West, Amare, Bosh, Aldridge (he literally makes the last two look stupid). Nene has more size and bulk, so he is a better fit for post-oriented power forwards like Gasol and centers. Overall, Kenyon is the better defender because of his versatility.
Petro is easily our best big at help defense and defending the pick-and-roll. He has proven to be a reliable post defender as well. Bird is the best help defender but the worst man defender. Bad at rotating and frequently falls for pump fakes. Gets abused in paint when bodying anyone heavier than him.