This story obviously includes some non-Krakoa stuff as evidenced by Vision's breakdown when he is being told about Wanda being dead and it looks like Captain America is doing some investigating of the crime scene.Huh? Depends. He could be off planet or not allowed on Krakoa. He hasn't meant shyt in the last 4 or 5 Wanda stories. Didn't do nothing in her solo series.
There was a whole arc in her solo series that included Pietro and her mom. Robinson went through the motions of her kicking Pietro to the curb early in the series and then having him pop up in Wanda's moment of need in her penultimate storyline.
They are twins and have a deep connection. That is just factual.
So there is really no good reason for Quicksilver not to be heavily involved in this story in some way.
Him not being in this series would be like Havok getting murked and Cyclops not appearing because he's on the moon or something.