You're being very generous to refer to Trent's performance at any time in his career as having "mojo."
For some reason I'd think of "mojo" as resulting in more than 11 passing TDs in one's very best season. What's happened since means that a very cautious caretaker QB, one who might win you games with a great defense, is now toast. Let it go.
By the way, Losman sucks, and yet he produced our last 300 yard game and our last 3,000 yard passing season. He also had a season where he had 19 passing TDs. I can't imagine Trent staying out of the infirmary long enough or mustering the courage onfield to get 15.