It seems I misused the term, gerund. The title of my question should have
been "While" plus present participle OR present participle only." Your
second paragraph solves another issue I had thought about: time vs.
contrast. Thank you so much for your highly informative explanations and
for making my sentence clear!
On Tue, Aug 4, 2020 at 8:42 PM The Grammar Exchange <email@example.com>