It was more of a joke, RTI might be a number of how well your Jeep flexes, but it has no bearing on how well it actually works. A lot of people put a lot of merit into RTI scores, but in real off road conditions RTI numbers don't mean crap. I have seen several Jeeps that might not have good RTI numbers but have the right tires, tire pressure, traction, driver etc... Also remember that having a lot of flex can have negative aspects too, just look at the competition rock buggies that use a winch on the front to compress the front end a limit flex for steep hill climbs.
In short it's like saying one car has more horse power then another at a drag race, but it is who makes it down the track first still wins.
