Draymond Green, Carlos Boozer, David West, Josh Howard, Mo Williams, Jameer Nelson, Danny Granger, David Lee, Rajon Rondo, Kyle Lowry, Paul Millsap, Goran Dragic, DeAndre Jordan, Roy Hibbert, Marc Gasol, Kyle Korver, Jamaal Magloire, Michael Redd, Jrue Holiday, Zach Randolph, Jeff Teague, Jimmy Butler, Isaiah Thomas, Rudy Gobert, Gilbert Arenas, Tony Parker, Mehmet Okur, Gerald Wallace. Then there are guys like Ben Wallace. Undrafted and became an All-Star (he's outside of the range for drafts I'm using). But there are guys like Wesley Matthews (pre-injury), Jeremy Lin, Malcolm Brogdon, etc that are all drafted later that aren't All-Star but can be very good
Those are the guys since 2000 that have gone after the lottery and become All-Star selections. Over one per year on average. Odds are not in favor of development, but the chance is there. Usually there is at least one player that develops after pick 16 into a strong player that gets an All-Star pick. The list above is through 2015. That's 28 All-Stars picked after the lottery in 16 drafts - nearly 2 every year. Not staggering, but less rare than most people think and more good players can be found that aren't All-Stars but can be good (we all remember Varejão quite fondly - and we liked him better than lottery pick Drew Gooden).
During that same time 49 All-Stars came from lottery picks. That's just over 3 per year.
So reality is the odds are not too far off finding an All-Star after the lottery as compared to being in the lottery. Better chances in the lottery definitely, but far from rare or unheard of. And sometimes you find special guys like Jimmy Butler. His work ethic really set him apart - and Cedi has a great one as well.
It's great to get a high pick, but remember that the only top ten pick Golden State made themselves while building a championship caliber team was Curry at 7. Klay was outside of the Top Ten and Draymond was in the 2nd Round. They added Durant later, but they were championship caliber before he came on board.