I should hope not. So why the frowny face? (Yeah, I know I know.)
He is, but we haven't seen him in a long time. I think the last time was when he picked up Jade's dead dreamself.
And then presumably went back in time again, picked up Jade as a meteor baby, went to live on an island, and got shot while eating dinner with a mannequin.
Jade mentioned a cloud vision that included her and John meeting and talking with Grandpa. Unless that happened and wasn't shown, Grandpa still has something to do before he goes home and dies.
I'm pretty sure some of Jade's dreams turned out to be wrong, like everything she thought she and John were going to do on Skaia after, y'know, what happened. Of course, that could certainly still happen now, but you'd think she would have mentioned that her dreams of her own future include dog ears. She was kinda obsessed with that. Still a definite possibility though.
Of course, there are a few plot holes in the course of the story, bits of prognostication and outright previews that wound up just not happening. Like in the original
Alterniabound flash a year ago, Vriska claims she'd wind up sending all of her accumulated fortune to John, which never happened and probably won't now. Even Hussie can forget minor predictions that get run off the road by later main plotlines.
Meanwhile, on
What The Fuck Is Homestuck.
I bought the Hero of Light hoodie before knowing who Vriska was.
I regret nothing.