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Indeed, even if you just rely on Trek's data (for the Speed Concept TCT) the Speed Concept OCLV version appears that it would be faster than the P4 only when the average yaw angle is >15 deg if both were fitted with UCI-legal handlebars.

Not following you there. In Figure 11 the 7 series bike has a lower drag than the P4 at yaw of about 6.5 degrees. Assuming the front end of the 9 series has zero aerodynamic benefit, it should test identically to the 7 series if the handlebars were identical to the other bikes, right?

I eyeball(ed) the crossover point at (roughly - I'm not going to argue about 1 deg) being 7.5 deg. Based on that, and assuming that the "front end" has zero aerodynamic benefit, the average drag over 0 to 15 deg of yaw would be essentially the same. Hence, you'd only be faster on the Trek if the average yaw angle were greater than that.*

*Actually, it's not quite that simple, i.e., time at yaw vs. speed of travel vs. distance would all factor into it...but you get the idea.

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