Estêvão would've been a good pickup. Chelsea paid only £29m to Palmeiras for him, albeit a few years back. At the time Chelsea made their arrangement for him in mid-2024 he would've been a good backup option for Saka and might even have brought us a league title a season early. Water under the bridge though.
If we'd signed Šeško over Gyökeres we'd likely have missed out on a league title. Rogers would barely have been a good pick up at £80m let alone £117m. Pedro is in no way equivalent to Havertz, in fact if you offered me a clone of Kai or Pedro right now, the choice would be clear. Barcola was insanely expensive and will have to deliver 10–15 goals from that wing minimum to in any way seem worth it, but it's more likely Iraola gets sacked I reckon.
Eze and Madueke have also been somewhat indifferent performers, albeit league winners.