I think you're getting a little full of yourself here, TBH.
First off, let's stop talking about Rubio as if that decision was made AFTER they knew Haywood wasn't coming back. Part of the reason DL gambled on Ricky was because Hill screwed us. DL was desperate for a PG and Rubio was one that was available. Let's also not forget that Rubio had a stretch of ball last year that was the best of his career, so there was some hope he might be turning a corner somewhat, or that he might find new life in a new situation.
Anyway, as badly as things have gone, Gobert has been hurt a big part of the year, and the team has never really had a chance to jell, considering how big of a roster turnover we had from last year. The starting lineup Quin uses doesn't really play enough minutes together to be able to say it's the biggest problem.