Youk's return is going to create an interesting dilemma for all of them. I suspect the only way WMB will delay Youk's return to the lineup would be if he is still hitting at a torrid pace. However I think that will just be V waiting for a convenient moment as in the minute WMB goes 1/4 for example.
However even at the point of WMB coming down to earth, if he is still hitting pretty good I don't expect Youk to even be greeted by YOUKKKKKKKsssss. I expect the BOOOO Brigade to get cranked up pretty quickly. Not that the BOOOO Brigade should decide the lineup but what does V do if Youk is still not hitting and V just took one of the few guys that was hitting out of the lineup?
That is going to be a rough spot and in truth there is no reason to suspect that Youk will just come off the DL lacing the ball. At best I would think that he might start a gradual return. That is unless between now and then Youk figures out why he is not seeing those low, outside cutters and sliders from RF pitchers.
Everything falls apart for a hitter when suddenly there is a location for certain types of pitches where he is just meat. He knows it better than anybody. So since he is sure that once the pitcher gets two strikes on him he will just drop that pitch on him, he gets anxious and starts swinging at pitches early in counts trying to get a hit before the pitcher gets two strikes.
At that point, he is dead and right now or at least before he got hurt, Youk was dead to RH pitchers, a complete reversal of his early years as a hitter when he was at times more effective against RHer's than LHer's.
In fact, maybe if V uses his head, assuming that V can't find a way to have both WMB and Youk in the lineup at the same time, it might make sense to start Youk back first against LHer's so that he is not confronted with the whole RH pitcher issue as soon as he comes off the DL.