Xcel Bronze CAN be a step up from L2. They are ALLOWED to do up to 2 flight acro skills on floor WITH hand support, but it is not required.
On bars, they are ALLOWED to kip (choice of mounts), choice of circling skill, cast, and choice of dismount.
Beam... minimum of 1/2 turn on 1 or 2 feet, a jump or leap, a non-flight acro skill (CAN do a cartwheel or choice of skill), dismount - not a salto or aerial (can do a jump or L3, L4, L5 dismount or FHS dismount or RO dismount)
Floor... no "B" skills and no saltos or aerials... 2 directly connected acro skills, 2nd acro pass with 1 acro skill, dance passage with at least 2 different "Group 1" skills, including a 60º cross or side split LEAP, and a minimum of a 1/2 turn (but they can do a full turn).
Vault is like the L2-L3 vault.