I was discussing with my Arsenal friends for a while about how if Sanchez and Ozil never played together (say, we lost one) we'd be having this fantasy in our head that Ozil + Sanchez would be a title-challenging duo. Obviously, we now know that isn't the case, particularly not under Wenger. This has got me thinking about a couple other Arsenal what-ifs duo. The first one that came to mind was the Anelka/Henry duo. Henry was never meant to be Anelka's replacement. They were meant to play together, but Madrid's money meant Anelka's head was turned and we had no choice but to sell. I can easily imagine those two together to be a ridiculously powerful front two, even better than Yorke/Cole or Sutton/Shearer. Maybe enough to help us win another EPL title or two, perhaps in '99 and '03, but perhaps not the UCL given the Wenger factor. Another is the Cesc/RvP duo. They were at the club at the same time for a long time, but injuries robbed us of that duo. Cesc had to carry our team for years (Arsenal post '09 really had no business finishing in the top 4). By the time RvP was fully fit, capable of finishing top scorer twice (single handedly got us top 4 and Man Utd the title) Cesc already left. Given their complimentary styles (Cesc liking to play early balls, which RvP was a master at getting on the end of) they could have been an absolute world-class duo imho, especially before Rosicky and Hleb completely fell apart. A duo that I think was never going to work was the CR7/Kaka one. I just don't think Madrid, at the time, was very well set up to maximize them. Kaka's injury mean we'd never know for sure, but given their style of play and where Madrid was like at the time, especially compared to Barcelona, I'm not sure that galacticos duo would have worked out too well. Not until they could pick up the Modric/Kroos duo. So, can anyone think of other great what-if duos in football? Or perhaps duos that you think would never have worked anyway.