Personally I think some of the stats are a little off or maybe I am misinterpreting the scale. Sandaime is only half a point higher than shodaime. Sandaime beat Nidaime, Shodaime, and almost got Orochimaru at the same time.
Your saying that Jiraiya is weaker than the weakest Hokage? I hate to bring up this argument again but I think that Jiraiya and Orochimaru were equals. The fact that the "snake, toad, snail" theme is used for the sannin is evidence that they are of equal power(if that sentence didn't make sense wiki that quotation). I'm sure if you put up Orochimaru's stats that you would put him above Sandiame.
Just simply stating that I disagree with your ratings and I think that you should have a method to determine points otherwise your system will skew toward bias.