I don't know if I said it in my first post but I didn't completly underestimate the power of the Kage. I had faith that they could pull it off however you can see where I'm coming from with the disadvantage they have against the Jinchuuriki. However what you say is true. However with the Edo Tensai thing, we have to take into affect the time period. Like I was assuming that they were fighting back in the time when Nidaime Hokage was in power (which wouldn't make sense because the only Kage that would be alive would be Hiruzen and Hashirama, and Tsunade would be a little kid during their regime), but the hypothetical is more modern so the shinobi that have died all in the past could have been fair game for the jutsu. I can see Nidaime and Hiruzen as the powerhouses of the Hokage (Hiruzen's mastery of jutsu and Nidaime's powerful water jutsu), and Minato could would be the speed, Hashirama the master (In everything basically), and Tsunade would be the designated healer. The jutsu of the Jinchuuriki however have all seemed (from the one's we've seen anyway) linked to their Bijuu's characteristics (Roshi had Lava release from the brief encounter we've seen him in, Gaara and his sand) I'm not so sure with Utakata, Yugito Nii, Yagura, Han, or Fuu (due to the fact that we haven't seen or have seen little of them except for Utakata). Each Beast seems to have a unique trait about them with the exception of the Hachibi and Kyuubi as they're specific traits are just the fact that they're the two most powerful of the Bijuu. Mainly what I'm saying now is that Kage's are at the disadvantage, however they do have a chance (if they couldn't hold their own against strong shinobi they wouldn't be Hokage now would they). The disadvantage being the shinobi they're facing are above jounin level slightly (which is automaticly a small but fair amount of trouble skill wise for the kage), they're numbers (2:1 in favor of the Jinchuuriki almost), Two of the Jinchuuriki are in fact Kage level (Yagura, and Gaara, and arguably Bee if you want to go there), The added power of demons, that naturally increases the strength of the Jinchuuriki (all shown Jinchuuriki, have shown at least minimal skills in controling their demons with the exception of Gaara I think), not to mention that two out of the 8 have full mastery of sed demonic skills (Yagura and Bee, with the Hachibi being the strongest of the ranks in terms of Bijuu power and excluding Naruto because we've kicked him out of this fight). I'm not ruling out the Hokage's abilities and possibility of beating them I'm only saying they will have a harder time taking down those shinobi. I'm not in turn saying that the Jinchuuriki are easily going to be a match for the Hokage either only that with their automatic advantages that I've already stated the odds are slightly in their favor, assuming each could work together with one another.
I see you've been busy workin with those posts, you a Special Jounin now right. Have you made a bio yet and started training in the Training Grounds?