The Chicago Bulls may have unearthed a hidden gem in undrafted free agent guard Donovan Atwell, but the NCAA's new 5-in-5 eligibility rule and the chaos it quickly caused could send Atwell back to the college ranks and cost the Bulls a valuable asset. But the NCAA's new eligibility rule and a handful of lawsuits that followed have dramatically changed that equation. But as it turns out, he never officially signed that Exhibit-10 deal, which has suddenly created a problem for the Bulls. 5-in-5 eligibility rule, ensuing lawsuits mean Atwell can return to collegeIn a nutshell, the 5-in-5 rule gives NCAA athletes five years of eligibility across five collegiate seasons. And because he never officially signed his Exhibit-10 deal with the Bulls, he's entitled to return to school.