I had never heard about Michael giving the tapes back to Wayne. When I was working on the list of compositions for Michelle Mercer's book, I asked about the composers for the 5 compositions on that record. Wayne said he did not remember the session at all, which is of course inconsistent with the previous story that Wayne hated the session and blamed its failure on Duke Pearson. But there is a third story: a guy I knew got a copy of the date and told Wayne. Wayne said: 'is that the one where Miroslav does all that bowing?' This does not seem like 'not remembering' to me. Can't blame that on Pearson. No producer would go up to a sideman in mid-session and tell him he was bowing too much. That would have to have been a conversation between Wayne and Miroslav.
Anyway, I gave composer credit to everyone in the band as if everything had purely been improvised in the studio. Highly unlikely, but no alternative was offered. Cryptically, Duke Pearson's session notes say 'Universe' at the top.
In any case, I have never heard of Wayne asking for the tape back. It is true of Horace and it may be several dates.
I asked Michael when I last saw him in 2014 about the McLean date. He did say the tape was lost.