However Healthy Nagato used only
^^ Human path
^^ Preta path
^^ Naraka Path
^^ Asura Path but just creating mechanical armor
^^ He was about to use Chakra Cannon via Asura Path but get interrupted by Itachi... however as confident as Nagato looked I believe Chakra Cannon could finish Killer Bee... so it has to be quite powerfull.
^^ Also of course Chibaku Tensei... which is no doubt the strongest technique of Nagato... hovewer it is not focused offensive attack as Shinra tensei can be... or chakra cannons, missiles of Asura Path.
Kishi neither shows Old Edo Nagato using Chou Shinra Tensei... nor missiles or even chakra beam/cannon. When Nagato rejuvenated his body... then Kishi still didn't show Young Nagato using Shinra Tensei... not even weak form not even mentioning about Chou Shinra Tensei... also Chakra Cannon/beam also could not be used due to being to strong most likely or restricted by plot.
So Restricted Healthy Nagato was = Edo Itachi without Totsuka and Yata + Killer Bee + Nine tails chakra mode Naruto
Full power unleashed Healthy Nagato could put up great battle even against Bijuu mode Naruto or MS Obito..., and this is potentail of his Rinnegan alone if only he has healthy legs as well... or was even one of the fasterst characters then he would be in top 3 even.