Attended a HS coaching seminar few years back with Carolyn dorin Ballard, she made it pretty simple.
This is how I took it
1. Accurate and consistent- ability to read the lanes and understand breakdown can be highest avg bowler and communicate with rest team
2. Lefty / consistent spare shooter, ability to read lane
3. You lowest avg bowler
4. Highest strike % able to play multiple lines
5. Usually highest avg bowler, ability to make shots under pressure