With at most a car and a gun and a grin chock-full of charm, Dean's never had much; but he gets by, so long as he can add his family to the list. A great way to start. You've described Dean's life in that one sentence.
Dean fights for more than the soft dew of a hazy morining on a mountain road or the smooth arch oa a young woman's back as she succumbs to his rhythm... I like this passage. You take what we imagine about Dean and put it with something we know he enjoys and it gives him depth.
It takes a special kind of person to love a world that doesn't love him back. A very powerful statement. I've never thought of it like that before.
So when John takes off without even a word, Dean slaps on the smile and packs his guns backin the trunk and pretendsthat his life hasn't just fallen to pieces all over again. And there's the sad truth. Dean is the one left alone. JOhn and Sam do their own thing, don't answer to or consult anyone which leaves Dean flapping in the breeze. He'd the one who gives everything to his family and receives no acknowledgement or consideration for his love.