Hot take: I don't like Mendoza. Sure he may be better than Shelton right now, but I don't think he will be a top player for us.
He needs to be willing to pass the ball and play touch and go instead of trying to take on all comers. For any fans of the Premier League, he reminds me of Andros Townsend, fast but not a good finisher.
I may be wrong, given that he scored the most goals in the ISL last year but I also don't know the quality of those goals or the defending in that league so I'm sticking to it. In short, he's a one trick pony and defenses will wise up to it soon enough.
Mendoza is quite clearly not better than Shelton right now.