he is a max talent easily,..... but he does not make teammates better.
truly great players are usually great at two of scoring, defending, and facilitating. kyrie only scores. he competes on defense but he's too small to really have much effect. if he is on your roster you better have a playmaker to put next to him that can get other guys shots because kyrie is not out to do that and he shouldn't because that isn't who he is.
if im the nets i take the risk if i can get some kind of assurance he really wants to be all in. since you have ben and KD you may as well go for it especially if it makes KD happy.
if they don't want to, a team like the mavs should be willing to risk it. for whatever reason free agents never choose dallas although its a big market and great city. if they can get their hands on a talent like kyrie to put next to luka they should do it. its a good fit since luka is basically the PG and kyrie can focus on scoring like like when he was with lebron.