From JR's 1997 interview, I get the impression that Fleet never got close to JBR in the wine cellar. As soon as JR opened the door he saw the white blanket, the light was off but he "may have" turned it on after seeing the blanket, he can't remember.
ST: Okay, And then you moved to your daughter. Did Fleet accompany you into that room?
JR: I don't remember him being there. But I remember later thinking I didn't hear Fleet scream or call for help or anything at all, and that frankly seemed odd, but I might have been just out of my mind, I don't know. I don't remember, I don't remember him, I mean once I went to that door.....and when I took those stairs, I don't remember where Fleet was.
It sounds to me like Fleet saw him discover the body and immediately ran upstairs to summon help while JR was removing the tape and ropes. A perfectly logical and innocent reaction. Fleet never got close enough to feel or smell her - so he may well have not known she was dead.
It continues:
TT: John, again I'm not sure if I got the sequence right. You talked about you screamed also, and Patsy talked about that too. Does that mean when you first went throgh the door?
JR: No, this was when I was carrying her upstairs, as I came out the door. I just remember him (Fleet White) screaming.