I'm far from an expert when it comes to gestalts but don't the minds of the components merge into one with each one contributing something diffrent to the personality? Or is each individual robot still concious? If so being a leg component would be like playing stacks on with a train.
The BW combiners come across as more together and someone has already mentioned that Magnaboss would be a fairly well centred combination of his components. But Silverbolt would have existing knowledge of how chaotic combination would be. Wouldn't this hinder the mind meld? Like watching a movie with someone who has already seen it and pre-empts the entire thing.