The second article mentions delay based and rollback both of which seem to be appropriate for peer to peer graphs, but there is a third option: server authority. I created a game with mechanics very roughly analogous to fighting games (nebulous.io) where there is no client side prediction, no rollback, and a 20hz update loop. Clients just render what the server reports (with some smoothing). I never get complaints about fairness, and players can quickly learn to adapt to their latency to servers located in different regions. Its as well now as it did in 2015, when a significant portion of players used 3g or worse cellular connections.