In my perception, Sanchez strikes me as raw. Foyth, in a strictly footballing-sense, appears to me as over-confident in relation to ability (not potential, mind), or dare I say a bit "dumb". Now, that is not necessarily a disadvantage to a footballer, but it is to a defender. If anything, I see Foyth doing ok further up the pitch, where this particular trait can actually be a plus. If a winger tries something outlandish and pulls it off - instant hero. If a defender tries something similar and fails, well, you've seen for yourselves, on several occations. I have no academic reason to believe so, but I fear that such things are quite imprinted in a player his age, and not something you can easily "untrain" on this level without changing who the player are. My armchair coach badge suggests that we'd be better off making use of his strengths instead. Yet again, no malice intended, but one of the "dumbest" players I've seen - as in often being brilliant when acting instinctively but likewise choosing poorly when given time to think - was Robbie Keane, and he did pretty well for himself. Purely my opinion, of course.