A few months ago Jason Bloomberg published a great article in Forbes:
You're Now 'Cloud First.' Are You Ready To Be 'DevOps First'?
It is so true that in order to unlock the real benefit of the cloud, it's necessary to implement DevOps. If you don't start with DevOps, "productivity can grind to a halt because development teams can’t deploy their code.”
Cloud and DevOps go hand in hand - while you can have one without another, they are much stronger when applied together. It's a classic case where the whole is greater than the sum of its parts.