Is the problem not more that our central midfielders can't pass the ball into feet, to get Gylfi on the ball in dangerous areas? That's how I look at it. In AM/SS you're heavily reliant on your teammates to be able to affect the game. The alternative is that Gylfi drops deep to get the ball, the way Rooney used to and then he's much less dangerous.
I'm hoping Gomes can help with that, and failing that, buy a ball playing centre mid in January. It's also helped Gylfi having Bernard, Walcott and Richarlison around him to free up space, because teams have to worry about other players hurting them.
I've never had the slightest doubt in Gylfi's quality and ability to hurt the opposition, if we get him in the right areas. The goal yesterday was the highlight, but that delicious reverse, blind pass to Bernard (which Bernard then cut back behind our attackers) was a good example of Gylfi's quality.