This may or may not help with hotspotting, depends on your access patterns. Also, If you are expecting to make queries that have to touch all of the incident edges on a high degree vertex, as opposed to some small selective subset (by filtering on an edge property), you probably will need to run these using TinkerPop's OLAP options[1] that can be used with JanusGraph. High degree vertices (super nodes) are still a pain point for many graph engines, some just extend the upper limit of what is considered a reasonable number of edges further than others.