IMO I think that capping ability and bidability are 2 different things, with 2 very different genetic components. One refers to the dog's ability to "hear" the handler when highly stimulated and is a factor of the dog's nerve. The other refers to the dog's willingness to do as asked and is a factor of other aspects of temperament, most notably pack/social drive.
Yes, there are plenty of strong dogs out there who can cap well. Sometimes capping problems are raising/training related, and sometimes they are genetic. Most often in my experience it is a combination of genetic predispostion within the dog that makes it possible for the dog to achieve a drive level above the ability of it's nervous system to control combined with training/handling that regularly places the dog in that situation by loading the dog to an inappropriate level of drive.