When I started in 8 ball they put me as a 7 right out of the gate. Only had APA history in the Masters league, and of course word of mouth. No complaints by me. Just a comment that the jumping off point can be solely based on opinion and not relative math.I remember when the SL7 on my current team started playing APA. He was on a different team at the time, and many of us certainly knew how good he was. He started as a SL4 like every male did at the time. I felt it was gonna be fun to see how long it took him to get to SL7.
During that session, I played him even up as SL5. Of course he smoked me, but we had fun. (We used to play regularly on weekends at our club, along with several others.)
I'm not sure if he got there in 7 games or not, but I doubt it took 10.
That said, the LO slipped up when I signed up for a session of 9 ball. He started me off as a 7 I think. My first and only opponent at that SL knew me very well, and was extremely pissed that he had to play me straight up. I could have agreed to voluntarily increase my SL, but it was simply too much fun tormenting him in a straight up race. Year or so later and we still laugh about it.