The very last player that left Juventus just after 6 months here was Pazienza, it's a VERY unusual situation for the club and Rincon wasn't even close to be THAT bad to be sold just after 6 months in the team, also your thesis about 2 man in the central midfield zone and that Rincon is not good enough for it is a complete bull$#@! because juventus wont be playing 4231 for the whole year without making any changes in the formation