Sounds like a leadership question, perhaps the group lacked ambition and you thiught striving for a better result was acievable with the talent you had available.
It sounds to me like you've gone for a sales/competitive job here - they often ask you questions like that.
I would answer that it wouldn't happen - ultimately you'll get the best work from working as a team. Sounds a bit cliche but when a team works really well, it's great! xx