NASCAR pulled Logano Sr's hard card after the incident, meaning that he will have to stand in line for a paper credential until NASCAR deems otherwise.
NASCAR spokesperson Ramsey Poston also revealed that the sanctioning body is looking into Biffle's radio transmissions from the race. A lap before Biffle nudged Logano into the wall, he reportedly threatened to do so. Dave Rogers, Logano's crew chief, referred to the radio chatter after the race.
"It's just terrible that you transport two cars all the way across the country to come out and have a good, clean race, and a driver brags on his radio that the #20 car better have casters, because I'm going to fence him - and then pulls up and fences us.
"I'm sure NASCAR will review the tape and the audio. During the race, I went down and talked to a NASCAR official, and I said 'this isn't right - he's bragging about it'. And then he does it. And, at that point, the message is conveyed. It's a shame that people race like that, but it is what it is."
Kevin Harvick ran fourth Saturday, and rookie Michael Annett came home sixth, his best result in his 30 Nationwide starts.
Busch's flu symptoms worsened during Saturday's Sprint Cup practice, prompting the driver change under the first caution of the race, on lap 39.
"It's just temperature," Busch said after the switch with Hamlin, "When I get in the car and I get hot, I start not being able to see exactly straight. The car was really good, though. Unfortunately, I didn't feel it was in my best interest or the team's best interest to win this race to keep going. More laps and getting hotter in the seat probably would have diminished my performance a little."
Busch was confident he'd be back in the seat of his #18 Toyota for Sunday's Pepsi 500 Sprint Cup race.
"Another problem is wanting to get out today in order to compete in the full 500 miles tomorrow," he said, "Fortunately, today, we've got Denny Hamlin, who's a great relief driver that can drive for me. I can try to go back now and rest up, cool down to try to get this fever under control and be ready for [Sunday]."
Asked if he had a relief driver lined up just in case, Busch admitted 'not yet - I think I can do it'.
by Reid Spencer / Sporting News NASCAR Wire Service