Sesko has looked like he has a lot of potential the few times I've seen him. Has that strength you'd like in a lone striker.
Could be a tad awkward to have 2 young strikers who want to be first choice, but on the other hand, we're set to play 50 games this year and they can each start 25 games and get 25 games of say 20-30 minutes off the bench which is about what Mainoo and Casemiro will get to this year and basically the same as what Sesko will get to this year if he starts 3 or 4 of the last 5 games of the season, so not a step down for him in that regard. Maybe 4-500 minutes less for Hojlund. But also in real life there will be injuries.
For 42M, if the wages are reasonable, seems like a reasonable deal considering we don't know for sure Hojlund is going to be first choice here (and it wouldn't be an outright disaster if either guy is a solid 2nd choice striker for 5 years here and moves on at age 25 for most of what we paid, which is the advantage of signing 20 year olds who are at least good bench players, as long as we don't let them run out their contracts and they don't turn into pumpkins like Martial).
I think Solanke would cost at least as much and Toney is 28, so it's probably a 3-4 year solution at best with little resale value (though Prem proven and striker inflation means he can probably be sold at age 31-32 like Chris Wood was for a little over half of what Newcastle paid for him, and Toney is better so if he costs 40M, you'd still bet on getting 25M for him in 3 years from some desperate Prem side).