There aren't any quotation marks around Fontana's name in that memo (see The Making of Star Trek, p. 165). You may be conflating it with a memo referring to first-season story editor John D.F. Black, whom he referred to as John "D.F." Black and jokingly accused of ripping off Dorothy Fontana's initials. I can't seem to find the page that one's on, though. All I know is what's on the CD set, which I believe is correct: the first season used the electric-violin version arranged by Courage followed by the cello version arranged by Steiner, and the soprano version arr. Courage was used in season 2 and again (in a new performance conducted by Wilbur Hatch) in season 3. So this seems to be a case where Justman & Solow simply got it wrong.