Since Sakura and Kakashi are the first ones that he senses, and they are part of his team, I feel that he may have purposefully sought out their chakra first. It would be far too coincidental for him to sense Sakura and Kakashi specifically along with the other random happenings going on. I feel that he was looking to see if they were safe first and then became bombarded by everything else going on.
I won't include this in the build up because I am just speculating on all of this, and I also feel it does not further develop his relationship with Sakura, however it is a nice find. Thank you for sharing.