I don't know why, but I've always had the suspicion Schumacher did this to be diplomatic. They asked everyone and they all said Senna and he sort of went along with it..That's completely hypothetical and in my head, and going off a 2 second clip of him saying it, but I'm not so sure he really does put Senna above himself.
Incidentally there's a great interview with Prost about Senna here:
Ayrton Senna by Alain Prost The one thing that's always annoyed me about Senna docs is their near universal insistence on painting Prost as a cnut when he was clearly a nice and intelligent man and Senna as a straight talking saint when he was clearly a little batshit & very self righteous. Prost comes off very well, honest & considered here.
