Most of Bradley steals are him being front of his man. And also, the chase down stuff you mention, that is exactly how Bowen played defense. He never gave up on a play.
And here is Green's defense some nights with the Spurs. Green letting Jimmer go off is what cost the Spurs this game, as I actually watched it. Funny how people post this for Jimmer highlights on the thread of his.
Green is not as quick as Bowen. I don't get these people that say Green is more athletic than Bowen was, because nothing could be farther from the truth.
Green has some nights he stellar, but mostly he is just very good. Bowen, pretty much every night, was Stellar or Beyond. I have watched both play many many games. And Green is not on Bowen's level. Bradley is, Kawhi is, Allen is, but Green is in that tier below these types of defenders.