I bet Denver would reject an offer of the #1 straight up for Jokic.
Despite whatever his defensive shortcomings might be, the man is supremely gifted on the offensive end. Jokic is every bit as good of a passer as Horford and the Gasol's (probably will be better in his prime), but is also a very good rebounder and can flat out score the basketball in a variety of ways that fit into a modern NBA offense.
But I'd be hesitant about trading the #1 pick for just about anyone at this point, simply because Fultz does look like he has the skill set of a lead guard that can score and facilitate an offense at an elite level. And the thing is, a lead guard or wing that has those skills is probably the most valuable type of player you can have in today's NBA.