A switch leap is a B and in platinum you need at least 1 B in the routine. If all your other skills are As then a switch leap can fulfill the requirement. If you have another B in your routine (front pike for example) already then you can do a split leap.
A switch leap is not required in Platinum. Any B skill will do on floor.
I have my Platinum do a cat lap full, a tuck jump full, a pike jump, a front pike, or a 1.5 turn to meet the B requirement.
Lol, I am currently trying to convince my dancer/Platinum gymnast to do a tour jete for her B skill just to be a little different.