From a fantasy perspective, DY was a top 3b pick before his injury, and that was before anyone realized the offensive output of the Tigers this season. I had him ranked just outside the top 5 3b at that time. He is still 3b eligible in Yahoo, and coming back into that lineup, he has to be considered top 5 3b if fully healthy.
As for OF - again, before the season started he was considered a decent 3rd OF, now that the lineup around him appears to be much better, he is easily a #3 OF, and possibly a #2. Hits for avg and power in the middle of a high scoring offense? What more do you want?
If he is still available in your league, you need to question the competition you are up against.