When the sample is large enough. And according to you that seems to be 4 games.
The team was winning due to unsustainable hot shooting, easy schedule and amazing play by Burks, DM, Jonas, Favors, etc. The offense clicked against bad defenses. Inserting Rudy into the lineup was a big adjustment for everyone but we have also played harder opponents. It seems we overhyped the team a bit. And now that we struggle against good opponents (4 games, 3 loses) you conclude Rudy makes the Jazz worse?. You may have a point in terms of chemistry between DM and Favors but Rudy is the more impactful (and better) player. Give the team some time to figure things out.