I did say at the time that Paul would be by far the most successful, for me Paul was the one who was much more inclined to write poppy type songs, (like C Moon, Frog Chorus, Mary Had A Little lamb etc) I expected him to be at No 1 much more than John or George, they were far more serious and less eager to please pop buying teenagers..
I think Paul was motivated to create a sort of Beatles Mark 2 with Linda whereas J & G weren't interested in that.