When McMichael signed a one-year contract on June 3rd, I read this as "Epps isn't playing well." Obviously, in reviewing the Chargers tight end depth, Gates has the number one spot, and Wilson is pretty well locked in at two, unless McMichael shocks us in training camp.
But a fourth guy? That really surprises me. It could mean that one of the four signed tight ends winds up on the practice squad. That would be a waste of money, unless Gates' foot injury is worse than reported.