Do you have a source for TN saying that BM was in Denver for firefighter training? I've seen that repeated on this thread a number of times, but I couldn't find a MSM source for it myself. As far as I can tell, the first MSM mention of the firefighter training version of the alibi is from
this Daily Mail article which just says 'Suzanne’s husband Barry Morphew, 52, has said he was away on a training course for his job as a volunteer firefighter in Denver, Colorado, when she vanished.' But it doesn't give a source for that. And I don't think BM has ever spoken to the Daily Mail. So I wouldn't be shocked if they were just paraphrasing a social media rumor or something.
On the one hand, BM changing alibis could account for why LE became focused on him so quickly. On the other hand, lying about attending a firefighter training seems like the world's dumbest fake alibi since all it would require to debunk is asking any of the other firefighters. And of course there wasn't even a training in this case. So I'm a little hesitant to believe that BM went with something that transparently false. Of course, you don't have to look farther than the Stauch case to see that
some people aren't very good at lying to the police, so anything is possible.