I see this trade as a mistake but for a different rationale. They have been linked to trading Lynch all off season and into the season. They vehemently denied that they were trying, but as it turns out they were trying to move him. That's fine, I know you don't publicly state you're trying to trade a player.
But here's my issue. You held onto Marshawn, knowing you were trying to trade him. Started him the last three games pissing off your number one back (Jackson), let Joique Bell walk out the door, so now we are at the very least not as good without him, all for a 4th round pick? That's what you did all that for? Baffling.