his coma dream wasn't an alternate dimension he travelled to, it was, as coma!bobby said, a dark part of his subconscious. and if buck truly underestimated his worth to others, i think everyone in his dream would be living a fine and dandy life without him. but no, even though daniel was alive, in this world where buck never became a firefighter, maddie was stuck with doug (more permanently, since they had a kid), eddie had lost his son, bobby was dead. deep down, he knows that he's important to them.

but for the first time, he's learning to be important to himself. he's learning that he's not defined by what he can do for others, that what he does for himself matters too.

yes, his family has his back, but now, after this, he's going to have his own too.