If you read what I was answering...he was talking about the slapper (not every CF) as compared to his other bats that she is hitting well with. I said she would do worse with the slapper with pop and distance compared to whatever bat she is using
effectively.
He was talking about a CF8. I never owned one, coached a team with one, but one of the girls, my little pitcher has one on her High School team. She says the CF9 is better but there isn't a huge difference. I really don't know. But what I would say is even if you look at the batdigest videos on live tests, their exit speeds are not going down much if at all with the light bats. See for yourself! They measured something like 10,000 swings over-all and about a thousand between the two teens, about 15 years old. What should be noted is that both girls, especially the small one said, I hit best with the light Demarini, and my hits were the most solid, but I am going to choose the Prism because it is the prettiest bat. And she did.
One other thing that troubled me was the AXE bat. They both said it felt good hitting, and it had good pop, in the top 3 I think, but the grip was unconventional in that it changed their grip. Perhaps for the better, but none-the-less, they ignored it.