Sissoko was turned into defensive midfielder being a striker originally.
Alan Smith was turned into a midfielder as well.
John Barnes went from being a winger to a central midfielder.
Some times you've got it, some times you don't.
I don't think anyone would argue that John Barnes was about 10 times better as a winger, and only moved into midfield when he wasn't able to run.
Alan Smith was shite in both positions
And the idea of Sissoko as a striker is so frightening yet hilarious, I'm lost for words.
Henderson's major asset is is mobility and stamina. If you don't use those assets, or he loses them, he has no value.