Welll.....I dont think he would've to be honest. Moyes is very stubborn and has dropped Baines to the bench in favour of Lescott earlier this season.
You can also put that to shifting Jags to right back in favour of putting Yobo in. I know Jacobsen might be not fully ready, but it took another injury for Yobo for Lars to get a chance because everyone was injured - and he proved dependable against Pompey but lacking match sharpness.
Moyes seems like he needs to be pushed fully over the edge to drop or change his 1st team choices - Neville, Osman, Yobo, being 3 players no matter how poor of form he'd still play.
So I do think if Yobo wasnt injured Baines would be on the bench....even, like a thought would happen, sold in January which I didnt want to happen but wouldnt have been surprised at. He's one of the countries best left backs, has been since he was at Wigan IMO.