Player position makes zero sense.

I've moved this to the data section as the researchers would set players positions. 

Thanks @The About Average Jake.

We rate the players for the positions in which they have been seen to play.  Guardiola has only used Silva in a back four formation (thus involving full-backs, rather than wing-backs).  Of course, the idea of a "wing-back" is open to interpretation, as some see full-backs who are attack-minded, or who have been given and attacking remit, as wing-backs.  In the FM positional sense of the term, wing-backs are used when the manager employs a formation that sets up with three centre backs.