People around here know the numbers of each QB fine, but I only go by trends and what this season showed us for who this staff built this offense for...
The use of Sams correlates with the games Lockett missed most of the snaps, though it would've been interesting to see the balance at OSU had Lockett not gotten hurt. IMHO Sams was initially a change of pace against OSU to start that game and once Lockett got hurt and it was clear that Waters without him was ineffective, they stuck with Sams. Then the staff stuck with that formula when Lockett was out against Baylor. However, the overall plan from the time Waters became the starter, this team was built for the Waters to Lockett connection. That staff deviated from that when Lockett was hurt and it worked well, but this offense was never built to be for Sams. The rest of the season the trend is clear and they gradually turned the reigns back over to Waters. Its possible that Sams might have gotten dinged as some have speculated down the stretch, but Waters was going to get most of the snaps once Lockett was healthy.
This is a Waters/Lockett team and now the key is figuring out how to use Sams and if the staff thinks they have a back-up QB they can trust to move Sams full time to another spot, likely receiver.
It just all seems pretty clear from looking at that to me.