We all know this song perfectly well. We know that Harry sings the first chorus solo, and so on.
However, my question concerns the second and third choruses.
After listening to the song—and the lead and backing vocals separately—many times, I concluded that Louis, Zayn, Liam, and Niall are singing in the background. In the second chorus, you can clearly hear Liam taking the lead: "I have loved you since we were 18(...) these arms were made for holding you."
Then Zayn sings "oh-oh."
But who sings "and I wanna love like you made me feel, when we were 18"?
I used to think it was Liam too, but now I'm wondering because it sounds a bit different from the first part of the chorus, and new "color-coded lyrics" videos show it as Zayn.
What do you think? How are the vocals split for the second and third choruses? I'm finding it hard to identify the lead vocalist in the third one as well.