Mental gymnastics? Mental gymnastics is your belief that those data files are hard proof. Frankly your insulting tone is completely unwanted. First of all taking those data files as "Hard Evidence" is premature at best. If your other evidence is that Samurai was mentioned in the anniversary event well guess what Blue mage was mentioned too.
Here is some equally "Hard evidence" to support Blue mage.
1. It is an original and classic final fantasy job showing up in many final fantasy games in one form or another, way more than Samurai ever is. This is pertinent because Yoshida emphasized they were adding classic jobs true to final fantasy.
2. The In game mentions of blue mage. BLue was hinted at being added in the aniversary event same as Sam. Hoary Boulder mentions meeting warriors who use the powers of their enemies against them. Raubhan oozes blue mage as hes the Bull of Ala Mhigo, his fight with ilberd, oh and him being a very important blue mage character in FFXI.
3. The red and blue theme of Stormblood. First the Name Stormblood. Storm evokes blue and Blood red. There's even a dye in the game right now called Storm Blue. Then we have the Red and Blue auras in the trailer. Why add that? Just to be artistic? Then look at Ala Mhigo's flag color. Its purple like a combination of red and blue. Then we have the New Years Poem with Mentioning Crimson in the east (red mage announced in Japan) and Azure Squall in the west (possible blue mage announcement in Germany, considered the west) I find that it takes mental gymnastics to dismiss all of the color references as mere coincidences.
4. And now the Spider man shirt. What's Spiderman's color scheme. Is it possibly red and blue? How did spider man gain his powers, he got bit by a spider and now has spider powers. Blue mages get hit by beast magic and now gains their ability. Heck spiderman's rogues gallery are all enemies named after animals. Doc Oc the Vulture etc. Now you say well there is Sam Raimi, well guess what he wasn't the only one who directed a spider man movie, Yoshi P even states this. He hinted at spider webber, a possible reference to spider web which was a blue mage spell in FF8. All of Yoshi-P's shirts have been on the nose and fairly obvious. So why pick spiderman to represent SAM when marvel Has the Silver Samurai. Heck even Wolverine would have been a more obvious samurai reference as he has more samurai influences than Spiderman.
5. Those data files could be a troll, unused assets, or Sam can even mean SAMPLE. Yoshi is a big troll and I wouldn't put it past him to intentionally put those in the patch to throw people off the scent and to surprise them at the Fan Festival. The fact of the matter is we wont know until then.
So to repeat, we have a classic class in blue mage, a very prominent color scheme for the expansion, just as many blue mage references as sam references, The t-shirt and then the possibility that those data files are misdirection. These are all equal to your supposed "hard evidence" for Samurai and I state again that it takes more mental gymnastic to ignore all of this evidence than to repeat the mantra Sam Raimi! Datamine!
I honestly suggest that you take your hostility down a notch. There is no harm in discussing other possible options other than Samurai, the second job has already been decided so no matter what we type in the forums be they support for SAM or BLU, they are not going to change their mind now. So sit back and relax and let others speculate and please be civil.