Valde only became IGL because no one else could. With that logic, OG have 3 IGLs, when Aleksib is the only functioning IGL on the team right now. Also, again Zywoo became the AWPer because everyone else on Vitality is shit, he's also a great rifler.
Why does that mean the team will fail
If anything, it's a bonus. Nbk and Valde have given Aleksi full control, but if they are ever struggling Aleksi might ask for suggestions. It's like how flusha often calls in OT for Fnatic instead of golden.