Not sure I agree. Elvis C, Freddy Mercury, these performers had such tremendous talent first of all. When you say DNA, I'm thinking of that undefinable (and certainly original) amalgam that John, Paul, George and Ringo were able to forge while learning their craft in places like Hamburg. This led to a whole new art form. The 3 minute pop record. The "band" concept, genius and revolutionary recording techniques, gorgeous harmony, and of course new techniques on the electric guitar. These later artists definitely benefitted from the Fab 4 forging a new path but still stand on their own.
You can't overlook that the Fab 4 had to curtail their live performances almost completely by the time they'd become famous. Those others really shone on the stage. ESPECIALLY Queen.
If you wanna talk shared DNA, I'd go more with the other holy grail groups like the Stones, Who, Kinks, maybe Zeppelin.