I genuinely don't see the point of Gatland having taken Wade other than it probably pissed England off to have him called up on match day. Not even giving him a spot on the bench for today means there's no chance he'll get anywhere near the test squad, so effectively he was called up to play in 1 midweek game, at the expense of getting an important start for England.
Twelvetrees has similarly been called up as cover with no meaningful opportunity to stake a claim in the squad. It would've been far better for both players to have stayed with England in my opinion.