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Madara had explained this awhile back or at least I would venture NOW to say that this is what he meant.
Also, I don't think it was meant to be used OVER AND OVER, you guys have to remember how far the Edo Tensei has come since back in the day.
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- Let's start with this: Saru say's that this is "The 2nd's protocol" which of course is in regards to protocol for when this technique is used, so I would disagree with your theory ahhimane to a point.
Madara does state it/Edo Tensei was originally intended for wiping the map clean, ALONG WITH THE CASTER. Plus, the fact that it has protocol attached to it and it only works (though technically it doesn't) because his brother AKA Hashi has most likely used it in conjunction with his Mokuton.
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As the above page shows, Hashi knows what to do and Tobirama even says Brother! with Hashi replying Yeah!, so they were on the same page. As for any Edo doing it....I would say any Edo being controlled by Tobirama (or that HAD been controlled) can use it because as we see, Tobirama pierces his own chest allowing for those special summoning seals to come out which then keep creating the exploding tags/continuous explosion on top of explosion.
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(pierces his chest)
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(explosions, etc...)
I know you wrote that in your thread, but technically what you wrote in the beginning "is a jutsu any Edo can use" but then go on at the end to write "To use this jutsu, either the Edo person must know about it or the user, the one controlling the Edo, must know about it." And the name of your thread is
EveryEdo can do this...
Also, I think if it had to be compared to another Jutsu it would probably be Minato's version of FTG or (big, big OR) one must know how to use S/T Techs/Jutsus since (and this is only a theory but a theory based on logic) what comes from Tobirama's chest is Summoning slips which, as we know, every Summoning technique is a form of Space/Time Tech's.
(On page 6, which I linked above, Tobirama says "The slips summon other slips and keep on blowing up..Forming a continuous chain of explosions..!")
Also, I think the Jutsu was pretty dang cool. And as a note...I think Obito defended against it or protected himself from it as Saru says on page 9 that those black things Obito was using could be used like Onoki's Kekkei Tota in which it could be used for both Offense and Defense and can be shaped to fit whatever Obito is using it for. Though this comes a couple pages after...if you look closely at the pages between 5-9 Saru gets a first hand look at what is going on.