No a shinobi is ranked by his strength.. not the amount of jutsus.
Then by your logic tsunade should be first in top 10 considering she is the strongest in narutoverse? A character is ranked by everything: his taijutsu,ninjutsu,genjutsu and inteligence. Speed,strenght etc is included in taijutsu.
Considering that edo tensei is a NINJUTSU it is counted as Kabuto's power the same as toads are counted as Jiraiya's power. If you mark edo tensei as a tool then it is still counted as Kabuto's power the same as Samehada is a part of Kisame's power. It is a tool,but he is extraordinarily strong with it. And not to mention the rankings are made when characters are at their prime. Kabuto's prime is dragon sage+edo tensei. Saying that edo tensei doesnt count cause the characters would be alive is like saying that for instance Muu would beat the crap out of almost everyone just because when he was at his prime everyone else was a baby or not even born.