Hi Gabriel, technically speaking an Aruba 2930F VSF deployed using a Ring Topology (thus where last VSF Member is connected back to first VSF Member) is not going to suffer of a VSF Split scenario in case the VSF Ring is necessarily broken to add an additional VSF Member...that's because - with the ring opened - any VSF Member is still connected to any other VSF Member through the resulting chain (that's the contrary of what is going to happen having a VSF deployed using a Chain Topology and you break the chain of VSF links for the very same purpose).
Have a look here for Best Pratices about new VSF Member provisioning.