Because CuseFaninVT says so, that's why.
He never had an offer or any serious interest from any pro team, any college team or any AAU team, for that matter.
He was selected because he is the only candidate John Thompson Jr would support. He's the only candidate that is beholden to Big John for his getting the job. He's the only candidate that will take and execute the orders of Big John. He's a freakin puppet and if you don't understand that, you don't get it.
The University had no choice but to hire Ewing. As with his son's tenure, Big John makes the decisions at Georgetown.