Don't need them. If I know what amortization and wages came off, and what transfer profit is being binned off versus what was realized in the window, the only things I don't know that are relevant under the present rules are revenue shifts. I can make fairly educated guesses on things like changes in the value of the TV contract from other publicly available information. If the Prem signs a bigger contract with a broadcaster, that filters through to clubs according to a formula. Ticket revenue doesn't jump around much unless COVID gets in the way.
I don't know the value of things like changes in sponsorship values unless the club tells me in a press release, so there I have to guess.
Assume that the error terms cancel out if they're all inflated by add-ons. The inflated values you take off should generally offset the inflated values you take on, unless there's a big discrepancy between the total value of the previous contracts and the present ones. Do not let the perfect be the enemy of the good.
Do I know with precision? No. I can tell you that it is very likely that the club didn't have enough to sign another permanent until we settled Gueye. If PSG was at 8 and we were at 2, that's six million pounds, which comes out to 30 million when amortized over a five year deal. If we had it, we would have used it, because we're obviously pushing right up against the spending limits this season trying to stay up at all costs. That's self-evident and confirmed by the data.