Full Idea
It seems plausible that a disposition could be possessed though no manifestation events occur.
Gist of Idea
There could be dispositions that are never manifested
Source
Stephen Mumford (Dispositions [1998], 01.6)
Book Reference
Mumford,Stephen: 'Dispositions' [OUP 1998], p.21
A Reaction
It is more than 'plausible' - it is screamingly obvious to everybody, apart from a few philosophers. "Some mute inglorious Milton here may rest" (Gray's Elegy).