As someone who actually saw swamp gas in action, and who has spent a lot of time gazing at both radar screens and the sky, I’m skeptical.
Hynek deeply regretted the whole ‘swamp gas’ business.
Ive spent a good amount of time in northern swamps but have never seen the gas phenomenon. Maybe the wrong kinds of swamps in the wrong locations.
Theres a will-o-wisp that "lives" in a swamp near here. I havent seen it but heard stories. The will-o-wisp descriptions actually sounds more like something else Im familiar with.
Im familiar with two debated origin FOs. One travels a ridge. The ridge runs from somewhere up in Michigans UP, creates Wisconsins Door county, and continues as a fault down toward Chicago. The other travels a different direction in the UP/Northern Wisconsin down through a long valley toward the West.
Ive seen an experiment by a couple of geologists who took a spindle of granite(?) and compressed it until it fractured. It generated a big ball of intense light they explained was piezoelectric in origin. This brief flash looked similar to the sustained moving glowing ball FOs I know of that some locals have claimed are visitors. Both of those FOs travel above obvious faults in the earth.
The will-o-wisp lives in a swamp just off to the side of one of those faults. Ive wondered if it isnt swamp gas but rather the expression of a secondary small fault and how many of the will-o-wisps Ive heard of could be explained similarly.