It's very possible we're playing hardball on fees so we aren't forced to sell a player in January to stay kosher under FFP. It's also possible that the way this goes is: if Gray is sold, we cough up the Leeds valuation on Gnonto, if not we hold our noses and buy Adams.
It's hard to see the structure of a deal that moves Lukaku here from those wages with three years left on his deal. They could save considerable money in the long run by doing it, even if Chelsea propped up wages, but doing that while accelerating depreciation probably results in FFP problems. If they received 35 million pounds as a fee, but had to offset wages by 250,000/wk, it saves them over fifty million pounds over three years but causes a 40 million FFP charge to hit this fiscal year.
It's an example of financial mismanagement that likely will cost Chelsea a full new player unless the Saudis bail them out, which seems unlikely. They're stuck running that one down and salvaging what they can on loan deals until the FFP hit becomes manageable enough to buy out his contract.