DarioKehl,
"...could the elders put their foot down & say they can't remarry because no adultery had occurred and based on this technicality, their gay divorce was unscriptural?"
"But I tell you that anyone who divorces his wife, except for sexual immorality, makes her the victim of adultery, and anyone who marries a divorced woman commits adultery." - Matthew 5:32 New International Version
The phrase used in that scripture is translated from the word "porneias" (πορνείας) which is not limited to adultery but refers to any sexual 'immorality'.