@Libra well, since the song clearly sounds like a Kelly song..... I say she played a big part, lol. That or her label gave her song to the group since they didnt plan to use it for Kelly.
in any case, this is really poor as a debut single, imho. I think they could come much harder, specially being that young. Normally new artists most of the times start their careers with a clear HIT song.
some quick examples that come to mind now:
Alicia with Fallen
Gaga with Just dance
Britney with Baby one more time
Christina with Genie in a bottle
Kelly Rowland with Dilemma
Tinashe with 2 on
Megan Trainor with All about that bass
and the list goes on and on.
This song wont be that case. So for that alone, this song wasnt a smart decision.