I noticed the same on first 2 lines grew better than the rest and the worst been crown.
My theory is that these first line were implanted first and the crown was implanted last, these grafts were out from the solution was more time, keep in mind that grafts can survive for some minutes out of the solution.
The other risks is solutions are not created equal some have atp, some are just saline water so the grafts will die pretty quickly there.
I am going to another surgery, that's why I would like to know why having poor growth.
Thanks