It may seem that way but it is misleading to think that.
It is NOT an easy thing to REMAIN in the corner when the ball is taken into the middle...most players INSTINCTS are to run in to try and help or rebound. It is NOT easy to remain in your spot and TRUST that TP or Manu will find you. That is why many times last season RJ would end up catching the ball INSIDE the 3 pt line and have a defender on top of him...so RJ would drive and clog the lane and throw off the spacing,etc...
also when he would catch the ball..his mechanics were to catch, gather, crouch down low, then spring up to shoot-allowing the defender to close in...
this season he is ready to rise BEFORE he catches the ball...
there are a few details that he has added that have improved how he fits into the offense...and of course-he IS hitting the open shots WITHIN the offense.