I'm going to start reverse engineering EVERY single thing I can. How? Cause I'm a master at seals yo.
That's what some of you sound to me. Do you not see the problem with that cause I sure as hell do. Actually I am right now claiming Edo Tensei through that same method. I reversed engineered it and such. So now I know how to use it.
It shouldn't be allowed or as my example up there shows I could just pick and learn what I want from reversing it.
Dead Consuming Seal. - I'm not even Uzumaki and I'm going to now know how to use it.
Six Paths Ten-Tails Coffin Seal. - Seal in it's name oh hell yeah gonna grab that.
Of course I'm exaggerating here. But you CANT use such thinking to attain something.
(I'm tired so my logical thinking here might be faulty)
In the case of Edo Tensei, you would need to have access to, at the bare minimum, an Edo Tensei body, and be capable of looking at the technique formula that controls the zombie. Even then, you would need direct access to the main scroll in order to have enough information to truly reverse engineer it. Otherwise, you might can make an inspiration knock-off, but actual reverse engineering of Edo Tensei itself would be much more ridiculous to claim than reverse engineerring hiraishin.
As far as teh Dead Consuming Seal goes, since using it kills the user, it is used very infrequently; unless the Uzumaki leave scrolls of it laying around where you can grab them (kind of like in the series eh?) it would be unlikely that you have actually seen the technique enough times let alone once to be able to truly reverse engineer it. The seal itself is based on the eight trigrams, so while from that you might could decipher the eight trigrams, I'm skeptical that summoning the Shinigami (without adding some SL-verse stuff) would be a stretch from just analyzing the seal. Copying the handsigns and chakra manipulation plus having access to the seal might would do it though.
There are actually special chakra requirements for Six Paths Ten-Tails Coffin Seal, so that would hinder its reverse engineerability considerably. But then again, I haven't looked up that technique in awhile so the specifics on it are kind of lost on me for taking a swing at that example.
What makes hiraishin so special is that it does not require any handsigns to create nor to use, and does not harm the user upon usage. Since the seals are typically not all that well protected by the average user, gaining access to one of them is not a once in a lifetime opportunity. It is also specifically designated as using a technique formula, so most if not all of the information regarding the intricicies of the technique can likely be found in each hiraishin seal. Conversely, all that could be in it is the users' chakra and nothing more, but I find that unlikely.