I also from that scene got the feeling that Jack know's he is Aaron's Uncle.. It was almost like he was throwing it in Kate's face.. So not nice Jack!!

As for Miles.. I think it is just like Daniel said to Charolette her attitude is not helping.. He said to the losties they are scientist and there to help not to hurt them.. Well maybe not to help the losties but not there to hurt them either.. I am sure they just want to get to work for what they are there for which I would ASSUME is to figure out the properties of the island..

__________________
Please don't give up, Des. Because all we really need to survive is one person who truly loves us. And you have her. I will wait for
you. Always. I love you, Pen

DESMOND: I love you, Penny. I've always loved you. I'm so sorry. I love you!
PENNY: I love you too.
DESMOND: I don't know where I am, but--
PENNY: I'll find you, Des--
DESMOND: --I promise--
PENNY: --no matter what--
DESMOND: --I'll come back to you--
PENNY: --I won't give up--
BOTH: I promise. I love you.