I have played 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 Bf8!? in a couple of serious games, so I have some sympathies for 1.d4 d6 2.e4 Nf6 3.f3 d5 4.e5 Ng8, which could actually transpose to the French after 5.f4 e6 6.Nc3. I think that White has some additional challenging options, though. Dreev has played 5.c4, while Georgiev has played the flexible 5.Be3 first. Still, even if the best that White can do is a transposition to that French line, from a theoretical point of view White should be quite happy.
These lines are all pretty minor and far afield from the King's Indian. Marin's 6...Be7!? looks very sensible to me offhand, but I wouldn't claim that Black has no problems to solve. I'm on my work computer without Chessbase, but I notice a game Moiseenko - Kayumov from 2014 that looks promising for White.
My idea to include some of the Pirc and Modern move orders in the book was to give a general outline of potential ways of playing against those openings that might lead to similar play as the Saemisch King's Indian, not to give an exhaustive repertoire. I wanted to provoke some thought about move orders and allow White players to decide for themselves how to best handle the Pirc and Modern, and include a few challenging ideas for White as a basis for further investigation. I also point out that White can't play too stereotypically against these move orders, or Black will end up with an improved version of a standard variation, and showed a couple of places where that can happen.
From a practical point of view, I've almost always played 1.d4 d6 2.e4 Nf6 3.f3, because my games have gone either 3...g6 now, 3...d5, or 3...c5 4.d5 with a Benoni or King's Indian transposition soon. I don't, however, think that 3.f3 is the best move in that position, which I'm sure is 3.Nc3!. I couldn't cover the entire Pirc and Modern as well, though!
Saemisch players aren't the only ones who face some move order issues against 1...d6, of course, and we all have to figure out how to best handle these sidelines for ourselves.
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