Full Idea
We might claim that dispositions are variably realized by a number of categorical bases; therefore they must be distinct from those bases.
Gist of Idea
If dispositions have several categorical realisations, that makes the two separate
Source
Stephen Mumford (Dispositions [1998], 05.4)
Book Reference
Mumford,Stephen: 'Dispositions' [OUP 1998], p.102
A Reaction
Cars can be realised by a variety of models, therefore models are not cars? This might work if dispositions are only characterised functionally, as Mumford proposes, but I'm not convinced.