Do you advise matching the SF troop type to the same type leader whenever possible?
Or are there tactical reasons to mix SF troops of different types with various type leaders?
i.e. Do you prefer to put Preservers with Lead Preservers and Operators with Lead Operators; or mix a squad of say, for example, a Preserver, an Operator, and a Commando, under a Lead Heavy Operator?
If you mix: how do you mix, and why?