What is Time Compression?

[Evol]

Ultimecia exists in her own present but is already with her consciousness in two time periods (meaning her past which is the present of our Squall also becomes her present while she also exists in her own present)ince she can control the power inside of Edea which is given to her by another Ultimecia entity and this way she can transfer her consciousness to another time period. Make that another time period with Ellone's ability (send consciousness to a body in a past time period, but the person can notice, like Laguna, Kiros and Ward do) and she can exist in three time periods which all become her present at the same time while they are her past and future from a certain point of view when it comes to time periods. The idea is simply to have "power over more time periods" and so she automatically fuses them.

Ultimecia should only exist in 2 time periods, when Ellone send Ultimecia into the past, she should no longer exist in Squall's time Ultimecia in Adel's body in the past and Her future self.

But if you mean She existed in three time periods (in Adel the past in edea the present and her future self). i understand what you mean.
But still her existence only exist in Adel's body in the past and Her future self at the same time.

Ultimecia just hates all existence. She wants to be the only thing which exists.

But She said she wanted to make Squall and others her slaves for eternity.
Which means there's no way she is the only who can exists.

And what you see in CD 4 and when the story is about to end is not the full time compression. The full time compression would mean the end of the story but they were able to stop her.

Nobody really understood what Time Compression is.
Yeah a lot of people always say if Time Compression is complete that would mean the end of story.
But i wish you can think differently about it for once.
For example the reason why Squall and others can go to the future because there is Time Compression. And the reason Squall can travel to the past with Ultimecia is because Time Compression still exist.
Without Time Compression time travel is impossible.