As far as scores go, obviously the Pull-ups are the most important aspect.
But for making OCS easier on yourself (and not getting killed) it is ALL about the run-time.
A guy who could do only 14-15 pull-ups but can run a 17:30 (and say a 270 PFT) will be much (!!!!) better off than the guy who can max the pull-ups but only runs a 23:00.
It is just geared toward a runner, as most events and daily PT are based on running a lot more than upper body strength.
That said, it is even better of you could run like a 19:00 or so with 15+ pounds of weight on your back. Those are the guys who tend to really smoke some events.
The last paragraph will be even more true at TBS.