The post he made. You can read it, I assume.
To wit, what he said was:
I think if you actually started looking at the starters on true legit contenders and then looked at their rookie years, I think you would be surprised at how much potential they showed. Obviously they aren't nearly as good or as consistent as rookies, but you saw it.
I could totally see Smart, Sullinger and Olynyk as being a 4th or 5th starter on a real contender. I've seen enough to know they have that sort of potential, but none of them have shown me enough for me to believe they could be all star level or better players.
And I agree with that. I then detailed how rare it was for a player to completely defy expectations and blossom into one of the 10 best players at his position (which is, nominally, what an All Star level player is) without anyone seeing anything before hand.
So far, we have listed three? Four? I am fairly positive that the collective hive mind of CB has watched a lot of basketball, and those are the only examples being given of players who really exploded out of nowhere -- and not just in the "no one watched him his rookie year" way.
You responded to the T-Mac thing, and in a lot of ways you hit the nail on the head: T-Mac's potential was always visible. The fact that he reached it (by improving on his handle and his shot) is an underscore to that fact, not a "but wait this thing" moment.
To be fair if Sully or KO or even Smart make an all-star game you could reasonably say "oh they showed that potential as rookies.
In their rookie years Sully(playing for the notoriously anti-rookie doc rivers) had per 36 numbers of 11. His second year those per 36 numbers jumped to 17 and 11, which is pretty much where they were this year.
If he gets in shape and is able to play 36 mpg there is no real reason he cant put up those numbers and make an all star team.
As a rookie Kellys per 36 numbers were 16 and 9.
I looked through this years all star game lineups to find players with statistically underwelming rookie years
Kyle Lowry
Paul Milsapp
Kyle Korver
Al Horford
Chris Bosh (his was bordelrline)
Jeff Teague
Jimmy Butler
Lamarcus Aldridge
James Harden
Klay Thompson (borderline)
Dirk Nowtizki
Demarcus Cousins
Smart, KO, and Sullys rookie years matchup with most of these guys. Sullys especially when you consider he was on a veteran team coached by doc rivers.