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This is what I have on testing of the 6.2 Cheers

The only thing I can think of that would blow the guts out of your glow plug is fuel detonating early in the cylinder, picture the fuel igniting way before TDC and the other 7 cylinders forcing that one cylinder on up over center with the injector adding more fuel when it should to make the PSI...

Well, If the piston collapsed and pinched the rings ( from getting hot or either used to start it) you should see a fair amount of blow by. I would not think head gasket because if it blew out you would hear it and if it blew between cylinders you would find low comp in both. Burnt, bent, stuck...

I went out to start my rig one day, turned the switch to run and in a couple of seconds heard a bang (sounded like a 22 going off) started looking and testing since I didn't even crank the engine. I focused on the glow plugs sure enough the plug in #2 cyl was bad so I pulled it and found the tip...

If the injector is known to be good but looks wet when you pull it out you may want to check compression on that hole.