Beno has been horrible at defending Johnson but it's something that can be corrected in an one hour in practice.
The fourth quarter has shown why Spurs need to have Beno as backup PG. With Spurs new big 3 rotation, there are 10 mpg without Duncan and Parker and Spurs can't aford to have a PG who can't score during this 10 min.
I like the way Beno is playing on the offensive end because he is aggresive. His shot is quite off for the moment (24% 3pt%) but at least he gives some offense and allow Spurs to score some points when Duncan and Parker are on the bench.
His assists number is quite low but it's too because some Spurs players are really cold (Manu 41% FG%, Finley 32% FG% and Horry 24% FG%).
So Udrih>Vaughn, even if Beno needs to put more efforts on the defensive end and needs to be more focused but he has still 70 games to be ready. I just hope that Pop won't be tired of Beno's mistakes and play Vaughn as backup PG because he is a very limited player.