I'm kind of jumping in here, but I have to say that this:

After all, S4 brought us Millers Crossing and lots of smaller, but no less important moments scattered throughout the rest of the eps where John is so transparently in love with Rodney in this intense, *earnest* sort of way. And then we got the finale where Rodney finally responds to John's virtual love letter this season and gives him 25 years of his life in return.

is the best summing up of season four that I've read. (And the reason I've adored this season.) Thank you. :)