10 point or bigger

I was watching the Bone collector crew hunting in Texas at the Wexford ranch. They were there " managing " this ranch and were aloud and did shoot all bucks up to ten points. My question is how do they know what and what not to shoot ? They were shooting spikes, 4 points ,8 points and a few bigger bucks. How do the manager's know what the bucks would have become ? (They were managing for 10 pts or better ).I would think this would fly in the face of aprs. Or is this Trophy management ?

10 point or bigger