It's not fair to compare this year's PG to this year's Kyrie. Irving is younger, and even then has less seasons under his belt. Of course Kyrie is going to be behind PG in development --- he's got two more years to catch up and 1 more season. Did he start at a younger age? Yep... which also says something. Irving also has a lot less team around him.
PG is a damned good defender, a hard matchup at his position, very versatile and smooth.... but Kyrie has the chance to be the best player of this incoming generation. It's his to lose.