Next step should be to trade Rozier, preferably for a 1st rounder in 2020 (the potential "double draft"). You're about to lock up your other back-up PG, you've got other ballhandlers at other positions (especially Hayward at SF), and your cap will never allow you to re-sign Rozier and stay out of the repeater tax without dumping one of your elite players.
Only reason Danny doesn't do this is if he thinks the team has a legit chance to win it all this year, and one year of a solid backup PG in Rozier is more valuable than that future 1st. (I think they do have a chance at a title this year, but I'd say that future first, if you can get it, is still worth the last year of Rozier's rookie contract.)