It doesn't contradict Charles' existence. Hugo is more like a Karasu, a midfielder who can dribble, defend and create.
Charles is purely a #10, a chance creator.
The roles overlap at times because BL does this thing where players always do multiple roles, but Charles is a more creative player. At the end of the day, Hugo is too "logical" to be as creative as Charles who is illogical.
Also, it is very likely that Loki is captivated by Charles' way of playing and isn't as much interested in Hugo's way of thinking This would mean Hugo would initially get his spotlight, but later on we come to find out that Loki wanted Charles to get better for xyz reasons.
So, we have him as someone who's like Julian Loki's right-hand man? Who gives him incredible passes? Who understands him? His existence basically contradicts Charles and Loki's relationship in many ways, it's even strange; Another problem with his existence is how he basically