You still got it half wrong. I2P hops don’t know each other. The big difference is I2P tries to make every user a relay while only Tor relays are relays. Hence Tor torrenting is not recommended because it overloads the limited relays, I2P torrenting is fine because you expand the pool of relays at the same time. I2P doesn’t really have exit nodes, too, so it’s a separate network from the internet.