After the skins used in game were posted, any similarities between him and Clarke were thrown out the window. Even if they were the same, that arguement is as valid as Richtofen being Amsel. Yes, the four heroes of Nazi Zombies share skins with characters from WaW's campaign.
Your other big arguement is their hairline and Thief's stubble. I don't know you, or your age, but something you must understand is that facial hair is something every man has. Let's not grasp at straws here.
I presented an analyses on their facial structure when the skins were posted. I'm no plastic surgeon but the differences present aren't something that change with age. For example, Clarke's nose is upturned, while the Thief's is more round. Your nose does not change as you grow old. The only way it'll ever look different is if you get plastic surgery or take one too many punches.
Anti Earth, you brought up how this forum was created to find hidden meanings in the Nazi Zombies game. I'm trying to discuss this in a civil manner but so far all you've managed to accomplish was insult anybody that disagrees with you.
You've laughed at the idea that Treyarch would take a formula from one character model and use it on another. You've also admitted that you don't know what that formula is. So instead of delving deeper to find out what the tattoos mean you've decided to stick with basic speculation. In doing this, you've overlooked one very key piece to this puzzle.
That formula is for Nova 6.
Two men of different ethnicities with the formula for Nova 6 tattooed on their faces? Hmm, what could this mean? I'd wager that the Thief worked along side Clarke in the Ascension Group. And what do you know, the next map just happens to be called Ascension.
So while you've bickered with people over something simplistic, whining about how "all these 5 year olds" don't know anything. Wishing this forum would go back to it's easter egg finding glory days, you let this one slip right under the radar. Stop being a damn hypocrite and contribute something to the topic other than "Nope, it's Clark cuz I said so lolololol".
I apologise for making this personal.