When 5th Hokage went in coma for weeks, Danzo popped up nominating himself as 6th Hokage, infact he became too..

But years before that when 3rd Hokage deceased the Hokage post was empty for weeks too.. Why didn't Danzo take that chance? Was he aware that Sannins will be given first chance?

When the 5th Hokage went into a coma for weeks, Danzo popped up nominating himself as 6th Hokage, which he in fact became..

But years before that, when the 3rd Hokage deceased the Hokage post was empty for weeks too.. Why didn't Danzo take that chance? Was he aware that Sannins would be given a chance first?