The Long and Winding Road

Was the recording of 'The Long and Winding Road', specifically, the unauthorized "remixing" of this song, the "final straw" for The Beatles, or was Paul McCartney the only one upset by Phil Spector's actions since McCartney *was* ultimately the sole writer of this ballad?  It's an interesting question to ask today because June 13, 1970 was the day that 'The Long and Winding Road' became The Beatles' twentieth and final number one single in America, according to Billboard magazine. 

"The Long and Winding Road"
Single by The Beatles
from the album Let It Be