Sub-graphs don't need to be balancers to be subtituted. Any sub-graph can be subtituted with something that's equivalent in functionality. [virtual-signal=signal-1] A conventionally constructed 2-5 has a 3:2 ratio splitter ([item=splitter], from "Sub-tree merge") hidden in it. [virtual-signal=signal-2] It can be replaced with a different 3:2 ratio splitter ([item=fast-splitter], from "Complete the rectangle") to create a new 2-5 balancer.