Johnson, the Alabama middle linebacker from 2009-12, has been watching this Tide defense closely.
He sees fewer issues than the 2011 group for which he was a starter.
"I feel like their defense was complete," Johnson said. "We had a lot of holes. Coach Saban did a well enough job to cover up a lot of weaknesses we had. I understand every defense has weaknesses. It's just crazy. They're complete. I don't think in 2011 -- it's scary to say it -- but we didn't have that complete defense.
"We still had a lot of holes to where we had to cover up.