Decided to look up to see where Warren and Booker were projected to go and I found a number of Mock's from 2014 and none of them had Warren going higher than #16. In regards to Booker, most had him being off the board by the time the Suns picked at #13, projecting he'd go #9 mainly. Only one site hit the pick and that was CBS Sports saying Booker would go to the Suns at #13 in 2015. So McD definitely deserves credit for drafting Warren since he would be considered a reach being picked that early and in the case of Booker he somehow got him even though he slipped.
Bleacher Report had him at #22
Yahoo had 2 mocks, here is
the other both listed at #21
NBA.com had him at #21
Bleacher Report had another mock where he went at #20
NBC Sports had him at #18
SB Nation had him at #17
USAToday at #16
NBA Draft Net had him at #21
NBA Draft Room had him at #17
Most of them had the Suns taking Rodney Hood or Gary Harris, generally picking a SG for them.
However Booker actually went a little later than anticipated by most Mock Drafts that I found.
CBS had Booker going to the Suns at #13
Yahoo had him going at #9
NBA.COM had him at #9
NBA Draft Net had him at #15
Basketball Insiders had him at #8, #10, #12, and #12 as they have 4 people list their picks.
DraftSite had him at #22
Bleacher Report had him at #8
NBA Draft Room had him at #9
Most projected the Suns to get Myles Turner, Kelly Oubre, or Bobby Portis, so a big at that spot.