To start, so you can see the angle I'm approaching this from, here's my thoughts on the continuity of seasons 1-4. Seasons 1 & 2 happened in the same place of course. Then you switch over to season 3 where seasons 1 & 2 are a TV show. I think that somehow no one remembers the D-reaper incident other than those directly involved and season 4 occurs sometime after season 3. This explains why in season 4 it is said that digimon cannot exist in the real world. I also think that it is possible that there could be only one digital world that has either changed over time or has different layers to it that the different groups traveled to. For this I am using that each group traveled to different layers of the same digital world.
I do NOT own digimon.
Unknown to all as the five digidestined returned home, as the digital world was made whole once more, something was there that should not have been. Unknown, that is, to all but three. The former great celestial digimon felt it come, and yet did not know what it was, they only knew that is should not have been. At first it seemed like a shadow or a ghost, but slowly it began to take a more solid form. It was scarecrow like in appearance. Most of its face was covered, it wore a tall pointed, purple hat, and a cloak of the same color emblazoned with strange markings. As it finally became solid it gave a low gasp, staggering backwards a few steps before falling to its hands and knees. Then it whispered one word, "Gatomon."
Meanwhile in the real world…
Takuya tossed and turned in his sleep. He had been having the same dream for some time now. It had started a couple of weeks after they had left the digital world, and continued through the three months that had passed since then. So it was of little surprise to him when he once again suddenly awakened panting and shaking at five in the morning. He knew that the dream was important, yet he could never remember it when he woke up. Only bits and pieces, that seemed to include, a vampire, a talking cat, a wizard, and a lot of screaming.
And in another…
It was beyond late, far, far beyond, but Kari lay awake. She could not sleep and so she stared upwards into the darkness. She let out a small sigh as she lay there letting her mind wander and thinking of all she had been through with Gatomon. She paused in sadness as she thought about Wizardmon and how brave he had been, what a friend he had been… and she slept.
What do you think? Constructive criticism is greatly appreciated, but please do not be outright rude. If you don't like it you don't have to read it.