Final answer:
Without additional context, it's impossible to determine the principal role player from the options given, as they could refer to characters or individuals in any number of scenarios.
Step-by-step explanation:
The question provided does not supply enough context to confidently determine who the principal role player is among the options given, which are Alex Rojo, Richard Silver, Bill Crutchfield, Jonah, and Johnny Fisher. In a general context, the phrase 'principal role player' typically refers to the main character in a narrative or the most important person in a given scenario. Without specific information about a book, film, case study, or another context where these names might be relevant, it is impossible to answer accurately which one is the principal role player.