2003 Venture overheat and gasket blown along with some other issues

Ok, determined that number 2 piston blew the head gasket but it seems number 1 has a 40% drop in pressure when I did the leakdown test, I felt air coming out of the dipstick so Im guessing the rings are shot. I pulled the intake off and valve covers and on one of the pistons, far right, cant remember which number it is, both the intake and exhaust rocker arm threads are stripped, exhaust bolt was completely pulled out and intake rocker was partially pulled out. Im dont know if this was a repair at factory cause some idiot overtightened the bolts or could this have been done by excessive heat when the gasket blew???