I really don't understand how people can buy the argument that someone would drive their $105,000 import sports car on a baseball diamond, or on the 18th hole of a golf course. Obviously there are other ways mud can get on a car, but for the purposes of the case, there are really only a few "reasonable" explanations. What it boils down to is that it is going to be difficult to find someone (especially the possibly presumed upper-class business personality of Owens) that would not keep that kind of vehicle in excellent shape. Especially if Malone provides testimony that Owens always took excellent care of his/her vehicles, then is it hard to believe that it was normal for mud to be on that Maserati (especially mud that was linked to the burial site of the victim).
You're assuming a lot here.
Assuming a team called Malone (not necessarily always the case), the "he cleaned his car all the time" argument is still weak. Yeah, Malone sees him going back into the parking lot to clean the car once, so what? Can we assume from that incident alone that Owens "always kept it in pristine condition?" As for Malone's statements that, aside from that incident, Owens "always kept it in pristine condition?" Objection, speculation, lack of personal knowledge. Even if the objection falls through, a decent Malone can work out of that on cross.
I do agree with you that the "Owens could've driven it around on a baseball field" argument in a defense closing sounds totally ridiculous, though. I've heard of at least one team doing this this year, and personally, even though that may be technically plausible, "he could've driven it on a golf course/baseball field" obviously sounds totally ridiculous and imo, takes away from the closer's overall credibility with the jury. In a strictly points sense, omitting that might help a score rather than including it and having the judges tune out the next 35 seconds of your closing while they're lost in thought about why the **** someone would drive their Italian sports car around little league basepaths.