So no conclusive evidence either way, then. Which suggests that 200+ posts on this topic have overblown the situation somewhat.
Players move on. All across the league. Sometimes by their own choice, other times not. Sometimes they get better opportunities/production elsewhere, other times they don't. It doesn't necessarily constitute a smoking gun of ineptitude.
P.S. If you really don't see the headlong rush to berate the franchise on every possible occasion, I'm not sure how I could convince you otherwise.