Okay sorry if I am repeating anything but here are my two cents.
The reason that Kate didn't come to see the baby is because she can't leave the country (she can't leave the state even I don't think because of the lawyer said), Sayid is a "hitman" for Ben (still dizzy from that one) and so I don't see him fitting such a visit into his schedule. Plus the fact that he is working for Ben makes me wonder if he took a different route then the rest. I have no idea why Jack would come but considering he can't even look at Aaron maybe he has a hard time visiting Sun, I don't know, all depends on the circumstances of why and how they all left.
I have a feeling that a lot more people are going to die before the end. It doesn't make any sense that Kate would be wanting to go back to the States (cause she's a fugitive) and so I am thinking that Claire dies and before she does give the care of Aaron to Kate. I agree that there is a chance that Sun maybe being watched but I think that Jin probably was really dead.
It is going to be a looonnnnngggg week thinking about everything though. Oh ya, what the heck was up the Regina chic, reading her book upside down (or pretending to read) and then jumping off the boat with chains and why was the Panda so dang important? And who the heck was in the coffin? WTH
What does it all mean?