Not gonna lie: The theory with the current time-time-fruit user appearing (doesn't matter if it is Toki or even Hiyori) and sending Kaido two weeks into the future, because he can't be sent any further, is actually quite intriguing.
On the other hand it also creates other problems.
What should they do with ten-thousands of beast pirates (including strong ones like King, Queen etc.) for two weeks?
How would that final fight against Kaido look, when he returns? Literally everyone could (and should) gang up on him then, it would be a mess for Oda to write that.