One word: Narutoverse.

Kishi reigns there so we don't know anything unless he says it.
One sentence: Kishi was not the translator.
I didn't say Hanzo used space-time jutsu I said he used body flicker and here is the manga page showing that
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In Naruto wikia it says:
There has been some confusion in some translations between this (Shunshin jutsu) and Jikūkan Ninjutsu (that would be time-space ninjutsu), but these are indeed different jutsu.
This is the article from Naruto wikia about Shunshin Jutsu (body flicker)
This jutsu is a high-speed movement technique, allowing a ninja to move short to long distances at an almost untraceable speed.[2] To an observer, it appears as if the user has teleported. A puff of smoke is occasionally used to disguise the user's movements. It is accomplished by using chakra to temporarily vitalise the body and move at extreme speeds. The amount of chakra required depends on the overall distance and elevation between the user and their intended destination. Shisui Uchiha was feared as "Shisui of the Body Flicker" (瞬身のシスイ, Shunshin no Shisui), likely referring to this technique.
The Body Flicker Technique has various variations among the different hidden villages, all of which involve some extra element aside from the movement itself. The extra element is usually some sort of substance used to distract the opponent, such as leaves or sand. Gaara, for instance, uses the Sand Body Flicker (砂瞬身, Suna-Shunshin), which uses sand to cover his movements. Other varieties include the Mist Body Flicker (霧瞬身, Kiri-Shunshin), Water Body Flicker (水瞬身, Mizu-Shunshin), and Leaf Body Flicker (木ノ葉瞬身, Konoha-Shunshin). The Fourth Raikage combined the Body Flicker Technique with the Lightning Release Armor which allowed him to dodge even Amaterasu in a split second.
Trivia
There has been some confusion in some translations between this and Jikūkan Ninjutsu, but these are indeed different jutsu.[2]
Kanji 瞬身の術
Rōmaji Shunshin no Jutsu
Literal English Body Flicker Technique
English TV Teleportation Jutsu
No wonder if there is confusion, the English TV translated it as teleportation.
Shunshin Jutsu is body flicker and that's exactly why I said the translation is wrong, and if you used Naruto wikia as a reference, then I think they agree with me, or more correctly I agree with them.
In case of Hanzo, yes you're right he used body flicker although it would make more sense if he used reverse summoning (which according to Naruto wikia is a part of space/time jutsu). However Kishi said it's a body flicker then body flicker it is.
Is it really Uzumaki's sealing tech? No proof of that, could be that Minato discovered it by himself. Space-time techs apparently in the manga are used to transport something and in my opinion only a part of the space-time tech users were capable of transporting themselves with it and it is probably instanteneous after the preparations have been made (meaning Minato's seals and Madara's vortex thingy swallowing him up). It just takes time for Madara to be taken in and spat out by the vortex.
Lol, I think we are splitting hair here, what I meant was that Minato learnt Fūin jutsu (sealing techniques) from Kushina, I don't know if the FTG seal was a pre existing seal or Minato, inspired by Fūin jutsu, invented the seal (most likely this was what happened, I agree with you), combined it with his space/time jutsu and FTG was created.
Possible, but I think it is unlikely, and it would have been mentioned by Kisame as 'And not only the two jinchuurikis and the mokuton user but I can't drain their chakra here due to some reason, I really am at a great disadvantage'. Usually the simplest solution is the best one, so I am betting on Samehada not being able to absorb chakra when he is inside it, after all it's a different form than when they merged.
You're right, you got a valid reason there. Still, I can't believe that's the explanation though, because the purpose of the fusion is to become stronger, if the fusion caused Samehada to lose its ability then it seems like the fusion makes them weaker. Well I guess we have to wait for Kishi then.
This is just my opinion though, I don't mean to disrespect yours or anyone else's
Hey, relax, I don't feel like you attacked me, and you don't come across as someone that disrespectful. And you certainly not like an obsessed individual which argued without common sense. This is what I called discussion, actually you just showed me that some of my assumptions were wrong.