Aie sorry if this is sort of redundant...but I sort of had a revelation just now? XD
I was just thinking that the person behind Envy and Lust and Gluttony...and...Greed and Wrath...is it Ed and Al's father-who-abandoned-them-a-long-time-ago? Because the haircut/facial hair is the same O0O Though one would think his hair style would have changed over...the many years...but yah know, what do I know XD And I only read the manga, so the anime might have some information that I am unaware of? Maybe everyone already knows this?
Again sorry if this idea has already been floating around or is...well known already XD Let me know what you think! *Considers x-posting this to the other FMA community*