Have you considered that Pop might also just be trying to motivate the other "point guards" by starting a D league player? Not that the Spurs don't have long term hopes for Cojo, clearly they do, but in my heart I still have difficulty seeing Pop rolling the dice with an unknown player this late in the season, especially considering the playoffs.
Tbh, I see this as a classic "Poptease". Spurstalk gets worked up with a new prospect...only to see Cojo sent back to the Toros next week.
I'm not saying Cojo doesn't have a chance to make it stick this year, but history seems to be against him.