In terms of coming and going, yes.
The bizarre thing is that I only noticed it post-stapedotomy. It could have been there pre-stapedotomy too, just covered by the pre-op tinnitus (it used to cover a wider range of frequencies) and thus, not as noticeable.
Now, there aren't that many tests that you should be going through to get you an idea of otosclerosis likely: Rinne/Weber fork tests, audiogram data (ABG, stapedial reflex), Carhart Notch, Schwarz sign, radiolucencies in CT... I don't know if you've gone through them, but if you haven't, it's a pretty simple next step.