I do wonder if the fixation on a "20 goal striker" is a bit old school. Teams often seem to almost have their "personality" wedded to the big name who bangs them in, and that's still the case at places like Tottenham and Liverpool, but look at City - last couple of years there was no obvious front man, and goals were shared around, but Champions League aside it still worked for them. And as for Man U - the "personality" striker was one of their biggest problems last year. Scored a load of goals, but did nothing to improve them as a team - exact same reason why Juve got rid.
Wilder's obviously more about the system than the names within it - a big problem last year was an imbalance between left and right limited the chance creating, and the strikers weren't clinical enough to exploit what chances were made. That imbalance feels like it's been addressed, and it sounds like the one thing no-one has doubts about with Forss is his ability to put chances away.
We obviously need more than just one forward signing, but unearthing a new goalscoring superstar isn't the only way to skin this cat.