I recall Hal Lindes telling in Facebook that they had a very large number of songs, if my memory serves, close to 17 songs, during the LOG sessions, most of them ended in other DS and MK records in the future.
Maybe during that time MK wrote BIA, i think the sessions coincided with the Falklands war, they gave it a first try and decides to leave it and concentrate in others.
I also guess maybe songs like "rudiger" or "secondary waltz" might had been there as we know both are very old songs that MK had written very very early but was never satisfied with them at the time.
Also Hal said he had tapes recorded with his Walkman of all that sessions, that he used to work in the songs.