It should be an institute but it is in its initial stages.So take out IK from PTI there is no PTI.There are no signs of legal process at the moment, if JH is relieved without a process it would simply mean IK is acting like a king (actually he has already proven that when he told his party's elected president that there ways are separate). Whether IK created PTI or not if PTI is an institute JH as an elected president holds a lot of sway and if PTI was an institution you would never say that PTI is IK and without IK its nothing.
I hope it should turn into an institution but it will probably take time.JH hold no sway in PTI practically.