Actually, I had heard before that George first wasn't satisfied with his own songs and he wanted them to be as good as the John/Paul ones before they appear on their records, which he managed beautifully: in a way, it was the same kind of motivation that was between John and Paul that existed also between he and Paul/John, which helped him progress. I had heard also that as he was singing some of the songs, he told the others that he wanted to sing his own.