Strange, as someone directly involved in developing RHEL6, I thought that I would know more about how we did than you did.
Here are the facts:
RHEL6 is based on Fedora which was our point of forking when it had a 2.6.32 based kernel. Note I did not say 2.6.32 stable.
After forking from mainline, we continued to work on tip of upstream actively during the alpha and beta phases on key subsystems.
Our developers would post to upstream tip, flag patches for stable and provide a backport to RHEL6.
Before RHEL6 went out the door, many subsystems in the kernel were 2.6.34 or 2.6.35 based. At this point, some subsystems are much closer to 2.6.37 (specifically things like file systems that we have a very large and active upstream developer pool).
This is a key misconception - RHEL6 is not a 32 stable series product and never has been.