Well if they don't fit the 1D image then it's understandable if they were rejected for that reason. Doesn't mean they're bad songs though, he could try selling them on to other artists. Zayn was always more R&B inclined anyway.
Tha boys want to grow up and make different types of songs tells me Zayn is writing teeny bopper ********. But, STeal My Girl is Teeny Bopper ******** as well, so... None tha less, it knocks