The linked article and this thread were really talking about offense, not defense. Even so, your comment about defense sounds good but is really a logical fallacy. Defense is as much (or more) about position, effort and especially "smarts" in a team context, than it is about speed. It is not a simple foot race. But if it were, your argument would be something like: Parker was once capable of reaching 100mph by giving 100% effort; but now he can only reach 80mph with 100% effort. My argument is something like: Parker once was capable of reaching 70mph by exerting 70% effort; but now he has to exert 90% effort to reach 70mph. I believe this is possible, especially if he is expending much less energy on the offensive end as a result of his taking on much less of the offensive load - which is the case. On the other side of my analogy, if he gives the same 70% effort and only reaches 50mph, he will quickly find himself in Pop's doghouse. I do not expect it to happen, but Tony's D could actually improve. Great players find ways to help the team when their primary skill is off and even when it begins to fade. Is Parker a great player? i never thought so, but he has been resilient enough to first survive and then thrive under Pop.