Board Thread:General Discussion/@comment-26006155-20190131130037/@comment-32182236-20190309130409

..Actually, I think I've just put another dent in the Gaster hypothesis. I'll present that first.

Since whoever the memorial was for died before or during 201X, then if Gaster died 201X or earlier, the CORE could not have been built after 201X.

Chara fell in 201X, and the monsters all reached New Home at the end of 201X (leaving at the start of 201X). The CORE could not have been built before this journey, because before the journey, the monsters were all living in the Ruins.

So, that means the CORE began being built in late 201X at the earliest. However, given that the monsters were simply looking to reach their New Home, the odds of them building the CORE in the meantime would be quite low.

The CORE must have began its construction after 201X, or very late 201X. It would not have been finished before the year ended. Gaster would have not finished his construction.

The CORE was built after 201X. So Gaster was alive after 201X.