I think, based on Tommy and Carleton's desire to out-Google each other and learn about fire-related hazards, they have made a good case for the two of them serving together as co-Fire Marshals if FMB retires any time soon.
If "nobody" is disputing the fact that a fire-related hazard existed due to this tank, I'm not sure why people are pasting links to draw the comparison that a death from an exploding LP tank on Saturday was less likely than someone getting killed by lightning. That feels like "somebody" is downplaying the risk as identified by FMB.
In regards to whether or not the 15-month ban should remain or not, I think it was Mike who pointed out the value that such a severe consequence delivers in the form of self-policing within each organization. Knowing that a screwup on a rule like this not only ruins this raceday but all of next year, a team is more likely to keep a closer eye on potential violations from within their own ranks.
I think this discussion is pretty helpful (well, maybe 5 of the posts). It seems like a very good idea for teams to seek the approval/advice of FMB before doing anything with combustible materials on raceday or truck weekend. Primarily because they don't want to see anyone hurt, but also to avoid an unfortunate and avoidable DQ.