It's not like this is something new. There were other incidents last year, then the Bell/Bryant thing in the playoffs drew a lot of attention from everybody, including the league. Add to that the fact that Kobe split LB's lip with an elbow in the very next game while Raja was suspended. This year he smacked Manu and caused enough damage that it could hardly be ignored even with no foul called.
When it happens over and over again, they have no choice but to look at it. This one looks pretty much the same as the last time, plus they called the OF. I hope they decide to be consistent.
This was a point I was going to bring up as well. Bell brought up Kobe's elbows after the close line incident, and it was evident the very next game that he was correct (Barbosa getting an elbow to the face and requiring stitches). I'm guessing the league is watched Kobe more carefully since then.
Edit: I'm not sure why I decided to quote your post and essentially type the exact same thing.