Well..., if it "went away..." I may stand by my original assesment. I know the full wide band gets thinner, but is still pretty evident on my breeding trio of Ancistrus dolichopterus...and any old adults I've ever seen. Your pics show a white tipping on the caudal (only), which is evident in other species, but that is not the stripe I'm familiar with.
I guess now is the time to also say that the first 2 pictures of your fish seem to indicate the fish is more of a coffee brown. The fish I know as A.D. is black.
Have you had fry yet?
Do they have the wide white band on the caudal and dorsal fins?
They'll be the final proof, I guess.