Bale has played as the AM in a 4-2-3-1 with Spurs as well on numeral occasions last season, and while it's not his natural position, he certainly doesn't "suck" there.
Özil to United would not make a bit of sense, United need a phisically strong CM/DM NOT an attacking midfielder, they already have Kagawa, Rooney, and Welbeck also being able to play that position. I'm quite certain he's going to Arsenal, also because it would be too great a failure for Wenger not to sign anyone after all this talk, he will push for him like crazy.