They play different positions - he can't really come on for the same players Tavares and De Neve can come on for. Tavares has one highlight in 4 months of football - a lovely interception and assist for an Ohashi goal. That's very worrying and I can't see him being here much longer.
Maybe he is terrible, but I've seen enough to give him a longer leash. Granted Baradji looks significantly better already (and can play multiple positions in Midfield).