The Leavenworth volunteer firefighter has been linked to arsons including one in March on Hoosier National Forest property.
A former Opry employee and witness for the prosecution said the defendant James Bowyer acted erratically the night of the fire.
A probable cause affidavit says extensive gambling losses may have led to the alleged arson.
It took more than a year to get ticketholders their money back following a suspicious fire at the Little Nashville Opry.
The owners were not owed the money because they failed to maintain the sprinkler system required by a contract with Indiana Insurance Company.