The Jazz can play great through multiple offensive means, as shown during the win streak. They don't need Rubio to be a 20 ppg scorer to win games against good teams. Its obviously a giant boost if he is, but its not necessary.
The big thing offensively is they need an efficient night from some source. That could be Rubio, collective 3pt shooting, FTs, Mitchell, or Gobert/Favors. The defense is typically good enough as long as the offense is OK the Jazz should be in position to win games against most teams.
Obviously against the elite teams (which honestly might just be Rockets and Warriors) its a bit different. Basically have to play perfect against them if they are playing well.