Hank was in the R&R Hall of Fame before:
Otis Redding, The Rolling Stones, The Temptations, Stevie Wonder, The Beach Boys, The Beatles, The Drifters, Bob Dylan, The Supremes, The Kinks, Simon and Garfunkel, The Who, Johnny Cash, The Isley Brothers, The Jimi Hendrix Experience, The Yardbirds, Cream, Creedence Clearwater Revival, The Doors, etc etc
Only 16 entries before HW.
Ray Charles and Elvis beat him, but not many others...