Paul Blair may have been the best CF that I ever saw. I didn't see Mays in his prime. I can't remember Blair having a bad collision in the Outfield. That being said, the collision with Beltre was Beltre's fault. He was out way too far for that ball. He should have expected Ellsbury to be there, and had it not been for Beltre, Ells would have been able to catch that ball without going into a slide.