Brook is good. Robin is not an NBA player.

could not have phrased this any better...brook has touch enough to be a solid inside option in the NBA...robin, on the other hand, will struggle...he's not a scorer in college, how is he going to get anything in the NBA? 

Yes, he's 7 feet tall, but shaun Bradley was 7'6 and had a horrible career...got paid, but was an aweful pro...and bradley got his in college (unlike robin lopez)

If you don't think they'll both be drafted, you obviously haven't seen them play and you're not a very good judge of talent.  The only reason Robin didn't score 20 a game was because he was playing on the same team as Brook, and when you factor in that Robin is one of the premier  defenders and shotblockers available at center, it's not too hard to see that someone will pick him up.

Brook will go higher certainly, but Robin is probably a late 1st rounder or, at worst, an early 2nd rounder...no doubt about it.

They're both NBA players.  At 7' tall if you can crawl across the floor there's a market.  And Robin is only shadowed by his brothers skills.., but if you look closer you can see that Robin also has good skill & plenty of upside.  And they're both very strong.  With NBA instruction & weight training they will both do good.  They're certainly better than the Collin twins & they made it.