Krystalak, Obsidious, and Glacies

Do you guys think Krystalak, Obsidius, and Glacies should be put in the Legendary series?

I think they should because they have nature element.

-Krystalak is a crystal monster.

-Obsidius is a lava monster.

-Glacies is a ice monster.

Krystalak

Obsidius

Glacies

Incase you guys don't know who they are, Krystalak and Obsidius are from Godzilla Unleashed and Glacies from Daikaiju Battle Royale.