ESPN has their high school rankings online going back to 2007:
http://www.espn.com/college-sports/basketball/recruiting/playerrankings/_/class/2007/order/true
Looking at #43 from each year, I only recognize one guy: Donovan Mitchell. Granted I don't follow college bball that closely, but he seems like a pretty fringe prospect at this point. He's still got two more years of development though, and this makes him a guarantee to be drafted (though maybe not in the 1st round).
I think at this early stage, whether or not Bronny makes it will still be up to him and his growth, whether that be in terms of skills or physical attributes. I browsed these lists and there are a few players in every class around or below #43 that stuck around to be, at the very least, useful NBA players for a few seasons. A non-exhaustive list of the names I noticed:
2007 - Chandler Parsons #44, Evan Turner #49, James Johnson #50, Jeff Teague #67
2008 - Miles Plumlee #47, Klay Thompson #53, DeAndre Liggins #57, Reggie Jackson #94
2009 - Solomon Hill 54, Kawhi 56, Derrick Williams 72, Khris Middleton 82
2010 - Meyers Leonard 47, Jerian Grant 96
2011 - Otto Porter 42, Ben McLemore 49, Norm Powell 52, Malcolm Brogdon 73, Trey Burke 84
2012 - Georges Niang 56, Rozier 74, Nik Stauskas 76, Fred Van Vleet 83, Montrezl Harrell 90
2013 - Semi Ojeleye 40, Zach LaVine 50, Kendrick Nunn 61, Christian Wood 71, Jordan Bell 78, Monte Morris 84, Josh Hart 92
2014 - Mikal Bridges 82
2015 - Dejounte Murray 49, Marquese Chriss 60, Shake Milton 79, Terance Mann 86, Aaron Holiday 88