This is a designed play. Rubio does a head fake to help sell it but if you look Oubre is already stepping into his jump before Rubio throws the lob and Frank is setting a (arguably illegal) screen. It is a beauty and perfectly executed. The offense last year (at it's best) seemed like something to the tune of "move around off the ball and hope something good happens!". The season before the offense seemed to be "hope Booker does something". I was a big fan of the Monty hire when it happened, but I liked it because it was someone the players would listen to, a true professional coach, I had qualms about him as an Xs and Os coach. So far I have been very impressed with his play design and strategy.
I worried some about Monty's play design but I think his time as an assistant helped him improve in that regard. It helps that he has a PG here like Rubio who can make damn near any pass that he can think up. Monty has spoken about Rubio's impact a few times and has said it's like having an offensive coach on the floor.
I'm so grateful that Charlotte wanted to overpay for Rozier because there's no way the Suns get off to the same start with him running the offense. It wouldn't surprise me if people were calling for Point Book to take over while bringing Rozier off the bench if they went that way.
I believe Rubio is one of the most under appreciated PG's in the league today. He is arguably the best passer in the league right now but since he won't go off for 40 like Kyrie, Lillard, Steph, or Russ he doesn't get much recognition for what he does. He won't give you an eye popping stat line but he will do everything needed to help those around him have those insane stat lines, like we've seen Booker have this year.
I can't wait to see Ayton return to be another lob target for Rubio. We'll see both of them take their games up a notch then, I hope. Oubre is the only real target for passes like that right now. Maybe Bridges could do some of what Oubre does but he's not nearly as flashy and would probably prefer a pass to lay it in rather than catching a great lob like that that will be on SportsCenter tonight.