This is rationalization Fred. And saying that he plays better fat than lean is hardly a scientific analysis.
I say this not to you alone. I say it my friend Username? too.
I remember George Scott ( the absolute best defensive first baseman evah!!! ) losing weight one season. He continued to rip and play the best D at 1st.
Plus he had new found speed on the base paths.
In general, it is not safe to make assumptions that fly in the face of science.
And while I'm blabbing, Ortiz continues to play well without the excess baggage. Maybe he has supplanted the fat with muscle mass? Maybe he is just able to run and hit better with less weight?
Jacko is correct. Panda is a time bomb.