All footpritns valid, though generally the footprints you map are slightly oversized. The two I flagged are the most obvious ones. A building's footprint is generally still considered accurate if it's slightly smaller than a pitched roof becasue it likely overhangs the walls somewhat. This helps avoid data overlaps and other issues in feature dense areas. Watch this video for an example of how to edit existing data in JOSM https://youtu.be/BDGP_-Dlepo?feature=shared. I hope you find it useful.
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            Published using OSMCha: https://osmcha.org/changesets/169172046
            