Chandler averaged 26 & 13 with 7 blocks per game his senior year in high school.
nbadraft.net scored Tyson a 107, with 11's in athleticism and potential, even gave him a 9 for his jumper and 8 for his post skills, and compared his upside to Rasheed Wallace. Tyson was super-hyped. otoh, they gave Jonas a 93 and compared him to Spencer Hawes and Primoz Bezic.
As Chandler demonstrated, being one of the best players in your draft even with exceptional length and athleticism guarantees nothing when the guys you're being compared to aren't all that good.
http://www.nbadraft.net/players/tyson-chandler
http://www.nbadraft.net/players/jonas-valanciunas
I'd love to compare what Givony said about Chandler back at the time he was drafted, but he has a funny habit of flushing out old content. Imagine that...
Although I disagree with basically every comparison NBAdraft.net has ever given, you do make a valid point. Imo, Chandler was a better prospect than V is, and Chandler still had to improve a lot to become a solid NBA center.
On a side note, one thing that seems to be mentioned a lot is how well he moves. He doesn't move like Chandler, Beindrins, or even Noah did at or near the same age. His body movements almost mimic those of Andrew Bynum. I don't know how well that will translate to the NBA considering he's a good 40-50 lbs less than Bynum. Either way, like any project C, he's going to have to get a lot better. He'll either have to develop a bunch of post moves like Bynum did (although Bynum had Kareem to work with), or he's going to have to put on 30-40 or so lbs without losing his hustle/motor or free throw touch for him to be worthy of getting good minutes in the NBA. I don't dislike Jonas at all, but I also don't see all hype currently surrounding him.
Note: I'd be saying these exact same things even if the Cavs had drafted him.