I am still wondering if that was actually Plus-x and Tri-X REVERSAL film. That would expalin the ASA 100 for the Premium 100. Kodak had to change the B&W reversal process mostly used for 16mm and Super 8 film school Movies, which resulted in a revision for Both Plus-x and Tri-X reversal. The premium may have been a way to salvage some unslit master rolls of each, (normaly a 72xx Film slit to 16mm, and further slit for Super8) Both would work fine as a still film, and they were Certainly cheep.
Likewise the Legacy Pro stuff was likly getting old in Fuji's warehouse, and with film sales down at the time, they were proably quite happy to let Freestyle take it off their Hands. The Legacy Pro bulk rolls did come on 100ft metal spools stamped "FUJI FILM"