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.
"Without seeing anything beforehand"?
I think plenty was seen by plenty of observers beforehand with both Marcus Smart and Kelly Olynyk.
Yes, I responded to the T-Mac thing, because I was reminded of my impressions of early Tracy McGrady.
His development has very little to do with a discussion of the potential of Marcus Smart or Kelly Olynyk, though.
For the record, whatever our young Celtics become, I don't expect them to become Tracy McGrady, in any way.
So, do you agree that they have no chance of becoming all stars, or just that players rarely come from completely out of nowhere to become all stars?
I'm not disagreeing with the second part of that. Heck, even Jimmy Butler always had an All Star in him somewhere.