Suspect had gold teeth - Anthony has never had gold teeth

Why did the defense overlook the fact that the only witness to the crime (Sam Vallabhbai - the store clerk) claimed that the suspect had gold teeth?

Why did the defense fail to point out that neither Anthony Nealy nor Claude Nealy had gold teeth, but that S's son (RW) and his close friend 'B' (with whom S, Anthony Nealy's former partner, was having an affair with) both had gold teeth.

Why did the defense not question Anthony's co-workers/ friends/ family as to whether he actually had gold teeth?