It's hype after all...
Remember before what they said about Minato before we got a better look at him? It was said that elders in every villages told their shiniobi to ran if the see the Yellow flash, his feats against Tobi, Kyuubi, Raikage/Bee, and saving Kushina from the kidnap. The jutsu he created Resengan, FTG, and Death reaper (not sure about this one 100%).
There was also hype about Madara, Nagato, Tobi, 3rd Hokage, 3rd Raikage, and so on. I guess people should get the drift because its the same case here. We are about to see some flashbacks of Hashirama, so we will see what he is truly capable of and how the battle between him and Madara went down.
Kishi played these cards to get us off are seats which will happen, but the hype of him being the best will die down once he is revealed in combat.