Elbows are a part of the game. Hell, you are taught to use your elbows - squeeze ball, rotate trunk, clear out space. Move ball up elbows out and if a guy is up in your grill, he is impeding your shot. You can't aim them, but you can throw 'em. Kobe gets away with them more than most, and he's good at using them for sure. Does it make them dirty? You betcha. Absolutely. But he isn't the only guy who throws bows...he's just really good at it. And when you are good at it, the refs don't see it. It isn't going to put anyone out for any time though.
However, Bowen stepping under shooters is well outside the realm of an elbow to the face. Kicking them in the back or stepping on them when they are on the ground. It goes directly to the ability to play the game, and for an NBA player, to potentially make money. It is not something taught. It is very effective though, but dangerous. Much moreso than an elbow to the face. For that reason, I put Bowen as the most dirty player I've ever seen play. What he did was nasty, devious and under the guise of "defense." The funny thing about this Metta Ron thing was that Bowen came out and called it dirty, and then Barnes (no stranger to dirty play) called out Bowen for calling anyone dirty. Quite funny pot calling kettle calling midnight black.
I have had several elbows to the face playing ball - played a whole game with a bloody jersey after catching one in the nose on a half court corner trap (not a foul called, either) and never got in a fight about it. The only on-court fight I was ever in was when a guy took my legs out on a layup, and I wasn't the first one in the fray - my teammates were. Don't ef with a player's legs, ever. You can elbow me and I'll get you back with my own elbow, or like Raja, will lay you out. Cut my legs, different story.
Amare, Vince Carter, Ray Allen, Chris Paul would all agree. They'd say Kobe plays dirty, but they'd say Bown plays dangerous.
BTW, Bynum is more in the dangerous category than dirty. The midair shoves are dangerous - he doesn't do them as often as Bowen did his stuff, and they are always caught when Bowen was rarely caught. But his fall into the dangerous category and Kobe's fall into the ******** category.