For anyone who has NOT seen Iron Man 3. Please go back and leave this page until you do. And for those of you who have seen the movie PLEASE understand this....
that just because the twist in Iron Man 3 made Aldrich Killian the film's true main antagonist along with the character saying that he is the Mandarin does NOT mean he really is the Mandarin. NO, because it only meant that he was the bad guy that Tony was really after and not only did he NOT were 10 rings on his fingers like the official Mandarin and did not posess all the powers the Mandarin has. Only one so lets take a good look at more of the Information below.
After seeing Iron Man 3, Aldrich Killian, creator of the Extrmis virus did inject the serum into himself and become super fast and strong like Savin, Taggert, Brant and all the other test subjects but by injecting the Extremis virus into himself not only does he have healing abilities which gives him speed and strength but also the ability to breath fire from his mouth like a dragon which turns him NOT into the Mandarin but into an "Extremis enchanced" version of this supervillain
and to help prove my theory is specific enough for all of you to understand take a look at this picture of the character and Firebrand below
Now you will notice that on the top part of the picture are Aldrich Killian from Iron Man 3 and Firebrand from the 1994 animated series and that on the bottom part of the picture both Killian and Firebrand from Iron Man Armored Adventures are breathing fire from their mouths. Plus with Killian regenerating his left arm like lave flowing out of a volcano and with glowing like lava and by melting the spot on the Iron Man armor in between the neck and the chest piece, Firebrand really does fit Aldrich Killian's Extremis ego and if Firebrand was never really Aldrich Killian or an Extremis based character that can regenerate limbs so what? Consider Killian in the movie as a new version of Firebrand otherwise you'll just be making the situation worse for everyone else, including yourselves.
Afterall we all know that wth Aldrich Killian appearing as a fire weilding Extremis Maniac, he does appear to be a more improved Firebrand than some cheap and unwanted knockoff of a Mandarin and Firebrand did have a grudge against Tony Stark