Also, keep in mind they are using the newer OMAP 4460, not the 4430 that is out in the bionic. They wanted to put in a dual core chip that runs at 1.5. Samsung only just revealed the next gen exynos chip clocked at 1.5, so it won't be available in any devices that are coming out soon. That chip probably won't see the market til Q1 of next year. So the decision was made because the next gen OMAP was ready first, it's google's chip of choice for ICS, it behaves well with LTE, and if samsung built the device with that chip in mind i'm sure there won't be any compatibility issues between the TI chip and the other Sammy hardware.
Also if you live and die by benchmarks you are fooling yourself. Benchmarks are not a 100% tell-all whether or not a phone is the top dog or not. If your Quadrant is 100 points higher than mine, but my device handles the user experience better, which would you rather have?