Using a commercially cooked chicken is :
1 ) easy
2 ) tasty
3 ) limits your ability to concentrate the stock , due to the salt content and seasoning choice of the establishment.
I use fresh chicken , InDoorSmoke // roast plainly and use minimum water , thus the stock gets concentrated
by water loss from the iPot each time you quick release .
etc.
I season at the time of use , and in different ways for different uses.
