Okay, so after some delicious research, I have decided to answer my own question.
Down below, you will see that a 6-inch sub is indeed 5 inches -- after I took a bite out of it!
It was 6 inches as advertised! And really good! Also as advertised.
Even the "Footlong" proved to be one foot (12 inches), I gave them to my brothers just now -- and they can testify that it is indeed delicious.
So, to conclude, it looks like the class action lawsuit over Subway sandwich length will have to wait for another day. Sorry guys! Maybe we'll get 'em next time!
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