A sobering, yet necessary view of the fantasy landscape is best to not overvalue or undervalue the trendy players of the moment.
Trade value in the world of fantasy football is a fickle thing.
Constantly updating injury news, suspensions (I'm looking at you, Mike Evans), slumps and hot streaks can depress or improve player perception weekly. This allows you to extract value from opposing teams and unload over-performing players on your squad.
Beyond aggressively hitting the waiver wire, trading is the best way to upgrade your roster midseason. There's, of course, the inherent risk in doing so.