See, I'm not seeing the I-Rex as having a vastly more powerful bite force than the T-Rex that makes up it's base genetics.
And don't get me wrong, biting through the aluminum oxynitride "glass" is impressive, I just don't see it being enough for the I-Rexs to hurt Kong enough before he tears them to pieces with his superior strength.
I think I rex wins this one, gunna put her feats in a spoiler tag:
Spoiler:
Claws and teeth that can casually penetrate glass that can withstand .50 caliber rounds.Takes down multiple Brontosaurus and those guys weigh 33 to 38 Metric tons.
Runs up to 40 miles per hour in her closed space and even faster outdoors.
Casually stomped a T-rex and tanked multiple bites from it with no real damage from the bites even to the neck, bite force from a T rex is 12,800 pounds or nearly 6 Metric Tons.
Withstood Raptors 6 inch claws with no tearing to its hide just minor annoyance.
Lifted and tossed an Anklysaurous which weigh 3-4 metric tons with one arm and tanked a tail swipe to the head and Ank's swipes break the femurs of T rex's and that Ank's tail swipe caused a huge fracture to a sphere made of the same glass that withstands .50 caliber rounds.
Has the agility and striking speed of a Raptor.
Has camouflage.
Smashed through multiple buildings and a stone balcony.
Is so strong and fast that it smashed through the Pterodactyl Aviary which was made of the same glass that can withstand the .50 caliber rounds and the Aviary glass was a foot thick.
Forced open an automatic steel door that was 40 feet high while it was in the process of closing.
Withstood a glancing blow from a SMAW rocket Launcher, and those things bust Tanks and cripples them with a glancing blow and I rex got up from it with no damage.
Tanked rounds from high caliber rifles like SMG's and even took some hits from that Helicopter gun, a lot of Helis carry armor piercing rounds and there was no damage to the I rex, it only felt pain.
Survived a bite from the Mososaurus, tried to even get away but the Mos's strength dragged it down to its underwater dwelling.
It only died because it was drowned by that Mososaurus.
I did some research on the planes that killed Kong, the type of ammunition the guns they used were 7.62 MM rounds or .30 caliber. I Rex's claws and teeth are more than enough to be able to penetrate Kong's hide.
Also all the things that the I rex did and survived were done rather casually and throughout the film did not suffer any serious damage. It only suffered superficial wounds and some bleeding I believe. And it was done throughout the course of the day as well.