I mostly agree with the previous statement. I know it is just a theory/rumor about keeping a player from another team. I am not sure if I am can see that. If they are that impactful to another team almost likely they would be for your team or at minimum an awesome back-up, especially given that it is not about scholarship $ is on the line.
To be honest, I haven’t even of that happening in college. Sometimes in the pros you wont trade someone to someone in your division for fear of facing them but even then it is on the rarer side.
I know it was just a theory and a point of discussion. I just wanted to waste 5 min. responding. 
On the college level, there is a lot more negotiating especially if the player has a super high GPA/SAT. There is an average that a school must have so a high SAT/GPA # allows some flexibility to take a superstar that is academically challenge. It is like the salary cap but for SAT’s.