Of course Arsenal have high hopes for him, this time Arsenal are trying to make a big bet on Kai Havertz, they hope that his arrival can provide great benefits for the team. Arteta will certainly support Kai Havertz to become one of the important players in his squad, but if other players are not friendly with the salary Kai Havertz receives it will cause new problems in the Arsenal squad.
Before a player agrees to join a club, there is a negotiation process involved and if the player has a manager that can get him a good deal, they get a good deal. Other players should not concentrate on what other players in the team earn but should be more focused on improving their quality and their importance to the team, so that they can negotiate a better deal at their contract renewal or move to another club that will be able to pay them the amount they wish to earn.