So Rey’s parents were nobodies, just ordinary people? Then how did she before force sensitive? Wouldn’t it make more sense for at least one of her parents to be force sensitive?
Why is there this idea that force-sensitivity can only be passed down? Sure, it seems to be genetic, but clearly that’s not the only way someone becomes force-sensitive.
Why did he stand there and let Kilo Ren kill him?
Kylo Ren didn’t kill him, the force projection was incredibly draining and he was going to die anyway.
Why didn’t he make the fight last as long as possible, giving the resistance more time to escape
They did escape, didn’t they? No need to delay longer than that.
and why didn’t he try to kill Kilo Ren right there?
He couldn’t. IIRC he wasn’t able to physically interact with the world, at least not to that extent, he was just a projection.