I don't think it's such an unknown, at all.
Ten Hag's failed approach, and the suboptimal roles given to our attacking players within this system, that has also starved them of service amongst other things, has been analysed countless times at this point.
Our forwards and attacking players have also shown they can be profilic or at least chime in with a respectable number of goal contributions, either at United under Ole, when the attacking setup was much better, or in their previous teams before joining us.
I'm not trying to convince you that we would be scoring for fun and amass 120 goals scored over the course of a whole season, like we did under Ole in 20/21, but our attacking department is way, way better than to just end up with a minus goal difference and finish in 8th place.
Considering that Hojlund scored 16 goals in all competitions last season, at the ages of 20/21, in his first year in England, suffering from injuries, whilst playing for one of the worst teams in the whole league with 0 service provided to him, I really don't think it's an outrageous take that he can already easily score at least 25 in all comps, and around 15 in the Premier League, in a better team and better tactical setup.
Bruno and Rashford can get you over 30 goal contributions each too, over the course of a whole season. There's plenty of evidence supporting this.
The likes of Zirkzee, Amad, Mount, and Garnacho should be able to rack up around 10-15 G/A without issues as well. Obviously they'll take away game time from each other so they can't all reach great numbers. Antony and Eriksen can probably get 5 to 10. The rest of the midfield and the defense around 3-5. Maybe Wheatley and/or Obi-Martin will get some game time and score a few goals later in the season too.
Like I said previously, we will need attacking reinforcements, and a big player eventually, someone like Olise could've been on that right side this summer, but the base level and scoring potential of our current players are way better than what they showed under ETH and even Rangnick before that.
Amorim should have no problems with trying to extract more out of them, whilst also adding new players as time goes on...but I don't think Gyökeres is the answer. In fact, I think he would be an abysmal choice to go with.
-Only proven against relatively weak opposition
-Scores a big percentage of his goals from transitions: we already have transition monsters in our team in Hojlund, Rashford and Bruno.
-Gyökeres is a very similar profile to Hojlund anyways, who already cost a lot just 1 season ago, with no guarantees that the Swede has a higher ceiling or even base level than the Dane.