You can definitely see the more rounded vs the straight of the Sharpie from the back with tail closed in most cases. The shorter outer tail feathers are only viewed from the underside. UNLESS, I am totally misunderstanding what you are saying here.
RobinHood.... It is still a Sharpie.
I really try to not go on ID sites from my phone... for just this reason. Sometimes I need to see the big picture!
Here is a rough guide of bird frequencies throughout the year in Cecil county. It is from ebird.org...
https://ebird.org/barchart?byr=1900&eyr=2019&bmo=1&emo=12&r=US-MD-015