Mirth most definitely. Arteta likes his occasional hoofball and aerial duels aren't Gyoks forte. Need Havertz or Merino up there winning headers and holding up play.
E: Plus as Dools has mentioned we now have a direct option and a subtle option who finds the soft spots that will open up as a result. It gives us huge tactical flexibility, as against the more of the same that Sesko's profile would have presented. Really exciting stuff. Hope he does well here!