Me Unavailable Dragonfruit Blackberry

How is it that erythritol can be the last ingredient in a list of eleven, and it still is so present in the flavor of a drink? Why even bother adding it at that point? It seems like it's worthless as a sweetener, especially when fructose is the second ingredient. Perhaps they just added it for the flavor.

Other than the natural diet flavor this is pretty fruity. The dragonfruit is more prominent that the blackberry. It's would actually be a really decent tasting diet drink, but it's not really a diet drink so it's a regular drink that tastes diet. No one wants that.