All the hermitcraft fans reeling about how Grian is a Slytherin and all us Evo fans are like:

This guy built an underground tunnel system to sneak into everyone's bases

He built a mob farm just so he could have endless tnt

He used said tnt on basically everyone and/or their builds

Declared war on Taurtis cause he defected from the Grian Empire and built targeted threats marketing to get him to return.

Took ALL the clay he could possibly find

Called out The Watchers on several occations and stole all the things

Convinced Salem to spy on the Mafia for him in return for not retaliating on the Base graffiti

And more

How could he be anything else?