Weedmon were born from Not Always Right
Quite a few Digimon have backstories according to which they were born out of various databases, archives and so on. Weedmon are essentially a race of Horrible Jerkass Customers from Hell. Put two and two together and... Grey Lord's Mansion is the Digital World's equivalent of the Spencer Mansion from Resident Evil
Aside from the fact that it's a spooky mansion full of monsters with a secret high-tech lab underneath, it's kind of obvious that Grey Lord's Mansion takes a lot of cues from the iconic Spencer Mansion from the first Resident Evil game. The front hall and the dining room in particular are eerily similar both in their appearance and their position in the mansion itself.It's likely Grey Lord's Mansion was derived from data found in Capcom's databases with Bakemon being stand-ins for the zombies and Skullgreymon being the stand-in for the Tyrant.
