My understanding - address your questions after the first part – this is meant to show different possible hierarchies that could exist. Not intended to show a signal for a DR event traversing all paths. Show diff hierarchies. Looked and said first column is maybe a utility operator (UDC), second might be aggregator one level down. On the right the DR resources that have to respond. Might have a sig from A to B to G to L - go through an aggregator, but A might go directly to E, bypass.