I don't think it's nailed on that he would make us a better team tbh. He might create plenty and score plenty himself, but leave holes in the team elsewhere, which others have to cover. Or he might be just like he was last season, hit and miss.
Aguero/Jesus are better goalscorers & Sterling/Sane do a much better alround job as part of our team than Hazard has done, most seasons in Chelseas team imo.
There is no denying he's a great player. but I'm not sure Belgium would be much worse, if you dropped him for Leroy Sane.