Understanding `A-Players` via the Levels of Roles

Let’s speak of a term of an `A-Player` not as of a quality of a person, but as of a description of a role, a person holds in a company. This way it's apparent to see that an `X-Player` takes an `X-Level Role`, or can take it any time when needed. Thus, we can make a pretty simple gradation of roles:
  • An `A-Level role` is about creating a difference. It is about being a part of the core team that builds the company itself and its boost in the future: strategic visioning, building the core of the product, setting up the culture, negotiations with core customers, building business processes, solving critical issues, etc. However, you can be nobody in the company but play an `A-Level Role`, when, f. e., you engage the biggest client, come up with a way to cut expenses on 25%, or show the way out of a rapidly evolving crisis. 
  • `B-Level Roles` are for doing a quality job and creating the value: selling product/service, administering the flow of tasks, team troubleshooting, doing engineering jobs, providing a good service, etc. Nothing complex, just being a good worker and doing your job properly. 
  • `C-Level Roles` are for assisting positions. Trainees, management assistants, business trainers, that, however, do not bring commercial value. Despite they are engaged in the business process and influence it, their impact is too small. We can also add here people, whose role implies holding a `B-Level Role`, that however do their job with a low impact or not properly.
  • Cleaners, massagists, cookers, security guys, office managers, etc., and all the other people of a business support layer (with the greatest respect to their time and work) are out of specific business processes and do not bring commercial value. Therefore they are not treated as team players (at least, up to the time they bring a commercial value or start influencing the income in a different way).

Speaking about the roles, we have also to understand that we are doing that in the context of a specific scale. The head of a department can hold an `A-Level Role` in department's work. However, they hold a `C-Level Role` in the scale of a company if the department holds an assisting role in the business process.