I already told you what he was referring to, you're the one whose in denial. Instant is instant, but the initiation can vary as we've already seen proven in the manga
If you want to ignore that then so be it. Already getting angry

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No, you've speculated on the unknown exact mehanics but nothing changes as creator of FTG made a statement.
Tobirama and minato had to be in perfect sync in order for their attack to hit Obito. If the invitation of the jutsu was too slow the. It would've failed and Obito would've countered them.
See no reason why would clone fail to sync, it never happened in fact, tobirama stated another reason.
Do you know why the end result always appears instant? Because it is. Tobiramas clone grabbed a truth seeking ball and teleported behind Juubito without him being able to react, and this is before the ball could even explode. That alone shows you how fast the teleportation was. Can't understand that then sorry for you, try reading easier mangas.
Lol by the time that ball exploded, Obito had time to point minato's fail out, sasuke to put susanoo on, tobirama to create a clone and get there, minato was the only slow ass stretching his arm but he too gave a speech i think.
fail arguments tbh, why wont you accept manga fact?
By the way 'brb in instant' expression, how long is it? Dont get mad so fast, i might lose interest
