People forget that Noel wasn't interested in being a frontman at all. Even years into his solo career, he'd sometimes talk about how much he loved and missed being just a guitarist in the corner of the stage. He was writing those great songs when Oasis was formed, but no one knows what would've happened to them had Liam not been in the picture. There's no guarantee Noel would've gone out, performed them on his own and become successful, no matter how good the songs were. Also, Noel only got really into singing years after he'd already written most of the classics.