I don't know about that list. Where does it leave someone like me - who played orchestral upright, then took a 20+ year layoff, and who now can sight read (although rusty) and can play many things but only after a few rehearsals? I'm not the best at memorizing lines, and it takes me a few reps to commit something to memory.
I guess I'm somewhere in here...
2. Street Players
3. Technically Challenged Players
4. Forcers
If I were as high up as a Rocker, I'd be pretty happy. I can work my way through a blues jam, but I'm scrambling for every note and once I find a riff or progression that works, I deviate from it only cautiously.
Perhaps there are two types of people: those who categorize others, and those who don't.
Or MAYBE there are three types of people: those who categorize others, those who don't and those who cry BS on the whole idea!!!!