I personally prefer to rate players from other leagues according to what their rival fans say. Bruno was universally accepted even by Porto and Benfica fans as the best player in the league, and he did fine for us. You can go back to the Bruno thread and find the exact same comments there that you can find here. “If he is so good why no one is signing him?“, “he is just stat-padding in a farmer's league“, “if he is any good City or Liverpool would have signed him“, “he only looks good because he is the penalty taker“. Exact same things were said back then.
Benfica and Porto fans both hate but completely respect and accept that Gyokeres is the best player in the league. That's all I really need to know on whether he is a good player or not. And NO, Arsenal is not the pinnacle for player scouting, especially not for strikers. When was the last time Arsenal scouted a world class striker? RVP 20 years ago?
All these stats merchant will always be able to find some stupid stats to discredit every single player in the world anyway. Even if we were to sign prime Messi, the stats merchant will bring out the “minutes % spent walking on the pitch“, “headers won %“, “number of times muscled off the ball“ and say that he is not good enough for the physicality of PL.