But as in the Kodak case, quite some people stated that they have not stored their Ilford films irregularly, and that they stored different film types the same, but only one type or so was affected.
Which kind of highlights the difficulty in tracking issues like this down to a core source.
They may have stored all of their film under the same conditions from the moment they got their hands on it, but what about every supplier between them and the factory?
Even when all the film gets carried through the same channels, there is still the risk that mistakes will be made. Maybe a mid level supplier accidentally left a pallet sitting out somewhere that it shouldn't have, and no one noticed. Boxes of damaged film get shipped onward, split up, and mixed in with the general supply as the rolls slowly scatter to the winds...
Or maybe something in Ilford's affected batches just makes them less tolerant of poor storage practices than other rolls.
And as a bonus headache for tracking down the source of issues like this...
Maybe it isn't just one issue causing problems?
The wonderful joys of Quality Control and Assurance.