In the Saemisch King's Indian
[FEN ""]
[StartPly "10"]
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O
It seems current (2017) literature and practice promotes Black's play 6...c5. What I am wondering is there something wrong with the Panno (6...Nc6 with a6, Rb8, b5) that got players to move to 6...c5 or is it just the current trend?