I think the real problem England face is that their best halves - Tomkins and Eastmond - play at their best at FB and Centre. If you had your first choice squad available I would think that Tompkins would replace Widdop, but who would be in the halves? If you go with your best halfback pairing, then you have to go with Widdop.
As a neutral I don't think Widdop was any worse than any of the other players you had in the squad, sure he needs to make a 10% improvement if you want to win an international, but then again so does the rest of your squad.
(But that's not that bad, all the French players need to improve by 50% to be competitive)