Hopefully he goes up against Paul (who btw has lost 4 times, more losses than anyone else has appearances)
How did I miss this? We're talking about the skills competition right now? The only event someone could dream of that's less exciting than the Rising Star Hot Spots?
"The NBA Skills Competition: Not Giving A Crap Since 2001"
It is not a coincidence though that the guy who gets the most press for being an elite defender plays in front of KG and Perk (or did).
Or, in fact, it could be. It seems that your argument is that playing with KG and Perk precludes Rondo from being considered the best defender. I don't think that's the case.
Well, that's not the case. What precludes Rondo from being the 'arbitrarily anointed best defensive PG' in my mind is that he is in fact not the best defensive PG. Neither is Chris Paul. Kyle Lowry is the best defensive PG in basketball right now. But, Paul and Rondo are right there.
But point guard is a hard position to gauge defensively anyways. Its a lot easier to see who the bad ones are than the good ones.

Yeah, according to synergy sports, Rondo was the better defender between Rondo and Lowry (with CP3 ranking a bit behind Lowry, but neither Rondo nor Lowry being all that impressive).
Rondo's ranks:
42nd in the NBA in overall points allowed per possession (0.79; allowed the opponent to score on 35.5% of possessions that resulted in a shot, trip to the line, or turnover)
43rd in the NBA in isolation points allowed per possession (0.67; allowed the opponent to score on 32.3% of possessions that resulted in a shot, trip to the line, or turnover)
27th in the NBA in post-up points allowed per possession (0.69; allowed the opponent to score on 31.3% of possessions that resulted in a shot, trip to the line, or turnover)
Lowry's ranks:
188th in the NBA in overall points allowed per possession (0.88; allowed the opponent to score on 40.8% of possessions that resulted in a shot, trip to the line, or turnover)
84th in the NBA in isolation points allowed per possession (0.75; allowed the opponent to score on 38.9% of possessions that resulted in a shot, trip to the line, or turnover)
11th in the NBA in post-up points allowed per possession (0.64; allowed the opponent to score on 32.8% of possessions that resulted in a shot, trip to the line, or turnover)
Now, a note on these stats:
Synergy tracks the initial on ball defender for many playtypes. For example, an offensive player is in Isolation and blows by his defender (player A) and gets to the rim. A help defender (player B) rotates over to try and contest the shot. We attribute the defensive play to Player A, as he was the person was initially beaten on the play.
We do not attach an individual defender on offensive rebounds, cuts or transition plays as these are team defense concepts and fault/credit usually cannot be attributed to one person.
The above means that there can be some skewing; since a PG gets the credit or blame for whatever happens after he lets a guy blow by him, presumably a player with a better interior defense (one that blocks shots, for instance, rather than fouling or giving up baskets) will fair better for the exact same defensive effort as a player who has weaker teammates. The stats also don't measure defensive plays like ball denial and positioning, etc.; the only things that count are shots, turnovers, and trips to the line. Still, it's an interesting look.