Why wouldn't he be happy?
The team traded Bayless, thus giving him more playing time AND a more creative role in the offense. He's the 2nd-string SG and the 2nd-3rd string PG. Mathewss is the other highly-regarded bench player and he's more of a complementary player.
One of the reasons we're winning is we're playing a pretty tight rotation. The starters are all playing a lot and IMO playing well, then there's Dante, Mathewss and Rudy mostly - at least in 2nd halves. That makes Rudy key player, one of the main barometers. Brandon Roy plays 40 Minutes per, Andre Miller plays less, if you consider that Batum is playing around 30 and Dante is mostly backing up the bigs right now - I think Rudy at least has a chance to prove himself.