I like Gyökeres, but I'm still not sure he's a player who can compete in the Premier League, especially Arsenal. While Portuguese league defenses tend to be quite spaced out, the PL isn't. The Premier League is the exact opposite. Gyökeres's key is his shooting, which requires him to create shots much quicker in the PL; he needs to be fast, otherwise he'll be blocked too easily and won't be able to maintain his place in the PL.
if a player is as good as he is hype, he can deliver in any league he finds himself, their is nothing special about the English premier league because if the intensity of the EPL is very high, it wouldn't take a good and intelligent player to understand adapt just in a week or two. So Gyokeres has no excuse to give, if he is good, adaptation wouldn't be the problem, let's take a look at cristiano Ronaldo as an example, he has always deliver goals in where ever he plays, that entails that he is good, that's why I don't buys into this idea that someone that is good will come into the EPL and start struggling, if he is good and intelligent as a player, he will adapt fast , because anything that makes Gyokeres fail to deliver in the first few weeks of his arsenal days, the pressure he might face might even kills his confidence completely which is going to be the beginning of his end in the colors of arsenal, so for him to succeed and prove that he is actually good, he has to hit the ground running without delay because pressure has already started mounting, and it's his performance in the field of play that is going to determine whether it's going to increase or not.