The best current comparison for Rajon Rondo is Tony Parker with more of a defensive mindset. The other key comparison is Mookie Blaylock. For those who don't remember or know Blaylock he was a defensive point guard who had a knack for scoring when necessary. At 6'1" and topping out at 190 lbs Blaylock played for the Nets, Hawks, and Warriors during a 13 year career. He averaged 13.5 ppg, 6.7 apg, 4.1 rpg, 2.33 spg while shooting .409 FG%, .336 3P%, .736 FT% in 889 career games. These numbers all compare favorable to Rajon Rondo and to what Rondo can progress into. However most scouts said that Rondo had better upside the Mookie coming out of college. So we could see some higher numbers from Rajon over time. As for the Rondo-Parker comparison here are the stats after their first 2 years:
Rondo:
26.7 mpg, 8.5 ppg, 4.5 apg, 4 rpg, 1.7 spg, .463 FG%, .229 3P%, .630 FT%, during 155 career games.
Parker:
31.6 mpg, 12.4 ppg, 4.8 apg, 2.6 rpg, 1 spg, .442 FG%, .330 3P%, .715 FT%, during 159 career games.
So while the numbers are slightly skewed because of the differences in minutes and games played here is what Rondo would have averaged if he played the same amount as Parker:
In 31.6 mpg Rondo would have averaged 10.1 ppg, 5.3 apg, 4.7 rpg, 2 spg while shooting about the same as he is now. These numbers are much more comparable with Parker's yet Rondo is still a better rebounder, defender, and overall shooter than parker was at the same point. The free throws will come to Rondo as will the points and minutes. However at the end of the day Rondo will be a point guard in hybrid model of Blaylock and Parker.