I am the developer of this tweak and the issue has been fixed. If you have any other questions please feel free to ask.
I understand your mistrust, and for whatever it is worth: I promise Sparrow Push is not stealing your email information.
The message loading is how Sparrow implemented it. It could be changed, but is a low priority for me at the moment.
NotificationCenter integration is working and system integration (ability to use the in-app mail window) is coming along well too!
Any update from Kim on this one?
"Sorry about the lack of updates. I've been sick, but its coming. Ill really try my best tomorrow!"