The ONLY advantage that I believe that the boys have gained a benefit from Zayn leaving, is that in future interviews they will have more couch space;) haha But really! They're always packed tightly onto one couch and it doesntly look very comfortable. Now, with 4/5 members they will be more loose, casual, and relaxed than ever!
(Definitley not saying that I'm glad Zayn left, cuz I love him & 1D isn't complete w/o him) I'm Just trying to look on the bright side of things guys, and possibly give you a laugh:)
-Tory