I have him solidly behind Curry, Westbrook, Paul, and Wall. Harden, too, if you count him as a PG.
Lowry and Conley are obviously less deadly offensively but are two way players who create for others and lead on and off the court.
Isaiah Thomas is a similar player but has shown more leadership and playmaking ability. He also put up bigger numbers in a larger role last year.
Right now the closest guy I have to Lillard in the PG rankings is Damian Lillard. Kyrie is probably more talented than Dame, but has yet to demonstrate that he's more than a clutch shot-maker who doesn't necessarily elevate average teammates.
Kemba is close, also, but isn't quite there.
Kyrie is clearly ahead of guys like Dragic, Hill, and Teague.
Assuming Kyrie plays a full season with the Celts in a larger role, I think he may surpass Lowry and Conley, and probably Isaiah (given the hip injury) but I don't see him definitively establishing that he's superior to Wall or Paul.
So at best, maybe 5th or 6th.
But, all of the guys ahead of him on that list are a few years older. Not many great point guard prospects have come into the league since Irving was drafted. So a few years down the road, he might be number one.