I came in late, but I think it was because although he fluffed the actual jumping, he scored high enough on the public vote.
I reckon the final two will be him and Sarah, and nothing against Sarah, but I hope he wins.
I agree, Paul did really well. All the others seem to have great respect for him. When he rides, he puts me in the mind of an Aussie(?) showjumper from the 1980s, Geoff McVean. He used to ride round the arena, arms and legs flapping all over the place, and would leap about three feet out of the saddle everytime he went over a jump. Nearly always went clearm though.