Small class sizes, a high intensity at practice and utilization in the defense that enables the 6-foot-4, 230-pounder to play either outside linebacker or defensive end.
"Notre Dame is Notre Dame," Drennon said. "When you go to Notre Dame, it's either you want to go there or you don't want to go there. Just from touring the campus …it's a small school and the (student-teacher ratio) is 22 to 1. It's kind of high school again so it's something that would be comfortable."
Count Drennon among the prospects who like what the Irish offer, including his recruiting coach, defensive coordinator Bob Diaco.
"The staff is nice," he said. "They're cool. I like coach Diaco. He's very high energy. That's what gets me motivated and pumped up.
"They're practice was very high energy. A lot of the coaches were yelling in people's ear just to get them going. It's kind of like how our practices are in high school."
During practice, Drennon's concentration was on the Irish's ‘Cat' position, a hybrid defensive end/outside linebacker spot.
"That's basically what I play at my school now," Drennon said. "Sometimes I'll be standing up at outside linebacker and drop into coverage and sometimes I will rush off the edge. It's no different than what I am doing know, so I would fit in perfect there."
As for the campus, Drennon said it was unlike anything he saw.
"Comparing Notre Dame's campus to other campuses, it's different," he said. "It's a Catholic school so there's a whole bunch of cathedrals. It's pretty interesting. That's stuff you usually won't see on a college campus, like the gold dome. It's just different. It stands out."
When he left campus, Drennon had a strong feeling for the Irish. That hasn't changed, but a visit two days ago to Penn State caused a slight shift in his early rankings.
"Penn State is No. 1, Notre Dame is No. 2 and Kentucky is No. 3," said Drennon, who holds two dozen offers. "Of all the schools I visited, those are my top three."
Drennon emphasized this was not his final three and things could change after he visits other schools, and as the recruiting process heats up.
He does not know when he will make a decision.