Pro wrestling doesn't have a good history of introducing imposters. Even though they say that imitation is the best form of flattery, that doesn't work when it comes to pro wrestling. However, there have still been many occasions of wrestlers' imitating another wrestler that have led to matches and even feuds between the impostor and the real character. Given the cut throat competition during the Monday Night Wars, it isn't surprising that that time period led to some terrible impersonations of gimmicks.
Bookers often underestimate the intelligence of fans with imposter gimmicks. The storylines are usually bad followed by even worse impersonations. Did anyone really think that the fake Kane with its terrible curly wig could ever fool fans?