Also, 8s don't need a B dismount as an SR, although if they didn't have enough Bs in their beam routine they might need it to fulfill the value parts. If they have 4 Bs, they can do an A dismount. In L9, a B dismount is required. I would say I'm seeing a lot of front dismounts in 9 and 10 over the last few years. More difficult to land nicely, but a front layout is a B and a front full is a C. However in L7 and 8 here, CW/RO BT is still very common. Fewer deductions and better landings, and it's the connection you really have to work, so if you get a good twister, you're good to go with full in L9. Otherwise, if they have a good front layout on floor, it's pretty easy to switch them over at that point.
And another thing to mention is that the series has to start and end on the beam in USAG (this actually isn't true in some high school rules) so a CW BT or RO BT dismount does not fulfill the acro series requirement - just the requirement to dismount with a salto.
And another thing to mention is that the series has to start and end on the beam in USAG (this actually isn't true in some high school rules) so a CW BT or RO BT dismount does not fulfill the acro series requirement - just the requirement to dismount with a salto.