Because you're clearly not considering the lack of leadership the team has when Hiko set out to take on that role, they have no synergy.
Btw Dres most played by far is Sage - 25/30 maps played on Sage, not sure what you're talking about with that Duelist BS.
Also not sure if you've noticed at all but the team asbolutely plays around setting up Hiko to win out late round situations. He SHOULD be the top fragger.
I agree with one thing, valliate has to go but Ven and Dre are solid and definitely have potential. Pride is on the fence.
Would I replace Hiko rn? No but if he cant find more success after changes then i think it pretty much points to his leadership.