That's no excuse on an Eckstine set. The released material is a finished product. From Hines through National, through MGM, through Mercury, through Roulette, it should all be there. Collate it, clean it up, get some good liner notes, and the set makes itself, I think.
I could see a stumbling block being the dreaded "lack of jazz content", but historically...
I know it's not going to happen. But somebody needs to do something. Billy Eckstine, even on his non-jazz records, is a truly awesome voice. And he knew how to use it. especially when the production was "jazz oriented".
A truly historical figure, imo, and one who is not being at all well-served by contemporary "history".