DARLINGTON, S.C.—Kyle Busch slammed into the wall and wiped out several orange cones on his way to the garage. Chase Elliott told his crew chief simply, “It’s killed,” after he was crunched against the wall at Darlington Raceway. It was a layout certainly “Too Tough To Tame” for some of the top contenders in the NASCAR Cup Series playoff opener on Sunday night. The last two series champions, Busch in 2019 and Elliott last year, were out of their cars and planning for next week in Richmond long before Denny Hamlin took the checkered flag. Busch raced closely with Austin Dillon, got loose, and tagged the outside wall in turn two before hitting the inside wall. He jumped in his car and drove straight off the track, scattering several orange cones in his getaway. Then Busch turned his frustration on his No. 18 team. “It shouldn’t be that” bad, he …