One reason is the intensity Nelson plays with, according to the article. After a drive that went nowhere, Nelson ran over to the sideline and threw his helmet on the ground.
"I love seeing that," a fan told the Bleacher Report. "We haven't had a quarterback that plays with that fire since, well, Jim McMahon, I guess."
Another reason Nelson's teammates love him is because of his selflessness, according to the article. After backup quarterback Taysom Hill threw a touchdown, Nelson didn't act like he was sad that he didn't throw the pass. Instead, he was the first one on the field and celebrated with Hill.