Matt, what your Flame Thrower went through is the normal drab down time I've experienced with all my male ambiloles. They can't keep up the breeding colors all the time, it's hormonally driven. I think we've talked about this before. My male hasn't gone through the first drab period yet, he's still brightly colored. This is a backward color progression, he's a whack job!
BTW, Flame Thrower is beautiful!! My drab periods last different amounts of time depending on the individual male, 3-6 months. Interestingly in captivity it's not an annual cycle. And my males don't go into it all at the same time, it appears to happen willy nilly. How long did your male remain drab colored?