AWS as a top storage vendor?
This is interesting since AWS isn't a storage vendor at all, they are a reseller. They don't actually build any storage themselves, they either have a custom manufacturer or they are buying from traditional vendors (see http://www.theregister.co.uk/2016/01/15/idc_third_of_it_spend_going_cloud/). Same goes for Microsoft.
What 451 Research is showing is HOW storage is being consumed, not really WHO is providing it.