Do you want an answer or something?
Was it not Hashirama who saw that in order to stop the war people will need to form an alliance, which will ulitmatly lead to an cycle, hence stopping the wars.. Was it not Hashirama who gathered the clans? Oh yes it was Hashirama.
Hashirama was the beast when he needed to. Please understand your own quote you presented deeply and then try to apply it to the characters.
In the end, they were all kept in check by Hashirama. He acted playful, because he could. He did not care for them being the Kages.. he was glad that they even came together with him. Just switch Tobirama with him.. and see if we even get to the Gokage conference.