In life, there's not just one angle, and there's not just two in opposition. That limitation is simply that, a limit of imagination. The big picture is only subjective and best seen from many angles. Every perspective is valuable because it opens up new possibility, which 'only' and 'either/or' are blind to.
Here's a sterling example of each creator enriching creativity by bringing something more to the previous.
MUDDY WATERS started it with his recording of Willie Dixon's song. (At this point, if there are any lawyers/accountants around, wrap your head around the concept of free promotion.):
MW -"YOU NEED LOVE" (1962)
THE SMALL FACES, led by blues wailer Steve Marriott, extended it in their cover:
SF -"YOU NEED LOVING" (1966)
Jimmie Page wedded a crucially memorable original riff with Robert Plant's interpolation of those previous recordings to create LED ZEPPELIN's breakthrough hit:
LZ -"Wholottaluv" (1969)
Eddie Hazel re-amped that new chord vamp into other territories with the album intro song for FUNKADELIC:
FUNKADELIC -"MOMMY, WHAT'S A FUNKADELIC?" (1970)
Going her own way from Ike, TINA TURNER deepened her Rock'n'Soul repertoire with this sexy grind on Zep's version:
TINA TURNER -"WHOLE LOTTA LOVE" (1975)
Lawyers will sue, separatists will divide, but those limits aside what is always missed is the real point: culture is a creative hand-off without boundaries. Give credit to creators? Of course. But limit creators from responding to life and each other? Never.
That doesn't protect creators, it kills creativity itself.