It would be very difficult to argue. There is at least Dalot, Malacia, Eriksen and Bruno between him and Varanez(
).
I dont really get why people are overrating pedestrian performances, he has been in the underwhelming bunch alongside Sancho and Rashford.
Fernandes has been his usual frustrating self. I don't think we can say he's been one of our 'best performers' so far. He's done OK.
Varane has been outstanding this season. Poor last season but already a huge improvement this...probably benefitting from better defensive structure and the team dropping ten yards deeper.
Martinez likewise has benefitted from the team dropping ten yards and from better protection in-front. We saw against Brighton that he struggled when asked to play high and on the front-foot (as most defenders do in disorganised teams) but has shown himself to be a good, aggressive defender since we changed to a slightly more conservative style.
Malacia I feel is benefitting from 'new signing goodwill'. I love his aggression and his attitude and he's largely done OK but I don't think we need to get carried away. There's some raw talent there but has a long way to go to be considered an elite fullback.
Dalot likewise is benefitting from the 'not being quite as terrible as usual' and 'the team are winning' factor. He's done OK but again, we don't need to get carried away. As expectations shift again and people demand slightly more than grinding out wins against bottom-half teams the old frustrations will return.
I'd say McTominay was absolutely awful, vile even, against Brighton. I didn't see the Brentford game but then he was probably our best player overall against Southampton and Leicester. So on balance, probably has been one of our 'better' players.