A quick scene showed Kate in a worse situation than others though, and if Jack makes a daring rescue to save Kate in next week’s episode, that might be the reason why she blames herself in the present for the death of her father.
It would also explain why just Jack perished in the fire when right now, it looks as though Kevin should’ve been the only one who survived.
The preview for next week’s special post-Super Bowl episode features Jack opening his bedroom door to flames, which means everyone else upstairs is just as trapped as he and Rebecca appeared to be.