If we had any sense, we will have negotiated the removal of payment for Dele as part of the deal.
£50m cash plus Dele on a free doesn't sound like much since we already had him, but it would be incredibly galling to end up giving them half the money back if he takes Richarlisons place in the side.
If we were savvy enough to work that in, and if Dele can slot into the side next year, I would actually think it was a decent bit a of business for once, as Dele has all the tools to be a great player if the circumstances are right, and honestly, a peak Dele Alli has a higher ceiling than a peak Richarlison.
I thoroughly expect yo be disappointed when we hand £20m back to them around January though.