Ares is the voice in Castle's headDuring The Punisher: Born, a voice in Frank's head keeps confronting him about his feelings toward the war that he enjoys coming to an end, and goads him toward making a deal that would ensure a never ending war for Frank to fight in. When asked who or what it is, it just mentions that it is in the same kind of work as Castle. A lot seem to believe it is death talking but I think it is but Ares, the Greek god of war, who in the Marvel Universe happens to be the only character aside from The Punisher to wear a uniform featuring a white skull on a black background on his chest.
The voice in Castle's head is the personification of the military-industrial complex.
Jigsaw is descended from Ladd RussoJigsaw's real name is Billy RUSSO, is a member of the mafia, and was very handsome before Frank got his hands on him. Ladd from Baccano! is also a handsome mafioso. Obviously, Jigsaw is Ladd's son or grandson.
MAX Punisher did not escape again between The Cell and The EndThese were two one-shot issues set apart from the normal timeline. It was never stated when The Cell took place. Admittedly, Punisher looks relatively young in that special, but beyond that it would fit perfectly, as the last thing he says in that special is that he's waiting for "the end".
Punisher: The End is the canon end of the MAX universe.It was set Twenty Minutes into the Future and published in 2004, so it could work as long as Marvel ends the line relatively soon.
The Punisher doesn't kill Kingpin, because of lingering mental controls.When the Kingpin had third rate psychic The Persuader brainwash Frank Castle, he had the guy place into Frank's mind subtle commands to avoid going after the Kingpin. While Frank broke with the overt control, he never did overcome the subtle commands. And so, he justifies reasons not to go after Kingpin.
The Russian ( movie version ) was the result of a Soviet effort to duplicate the Super Soldier SerumFor which he was a partial success: it gave him extraordinary strength, reflexes, and durability... but also gave him significant psychological problems.