Xhaka a Flop?

Granit Xhaka arrived from Borussia Monchengladbach in a £35 million transfer back in 2016. He was one of the best defensive midfielders in Germany at the time and Wenger opted to sign him over N’golo Kante formerly of Leicester after he had helped his team to win the English Premier League in a fairytale season. Xhaka has failed to provide the cover to the backline that the Arsenal team needed ever since the departure of Patrick Vieira. He has often been left exposed especially in big games because he does not have assistance in his role. Most of the players he plays with in midfield are attack minded and are even allowed to roam around the pitch which allows the opposition to counter Arsenal. Would it be a fair assessment that he has flopped even when the team is not playing to his strength and often isolates him? Some Arsenal fans think that the player can still be good but that the manager needs to be changed and bring in someone with fresh ideas because they have not progressed from their last campaign.