The complaints about Keita this season are more to do with his performances than what he's been wearing.
Some quotes from this Mirror story.
http://www.mirror.co.uk/sport/football/news/naby-keita-unlikely-join-liverpool-11257398
Have you watched his performances? He was man of the match in a 2-0 defeat to Schalke. Ever seen a midfielder be man of the match in a game they lose 2-0? The Schalke coach said he did the work of 2 people that day and was unstopable.
They won the next game 4-1 vs Freiburg with him playing as DM and still being the main creative force with 7 completed dribbles (more the the other 3 midfields combined) and yet conceded possession less than his midfield team mates too.
Was motm again against Hamburg scoring a screamer. Then against Gladbach (every touch video earlier in this thread) he was the best player until his sending off - which was a Mane-like moment of trying to win a ball that was head height with his foot.
The Beşiktaş game was the first this season he wasn't the best midfielder, if not player, on the pitch. He's absolutely ran the show for them every game. Their coach said after the Beşiktaş game his side wasn't prepared for it in any way. Whose job is that?