Base fee = € 57m

€ 5.7m to Alkmaar, € 51.3m to Milan plus € 15m bonuses = € 66.3m in total for Milan.
Base fee = € 70m

€ 7m to Alkmaar, € 63m to Milan plus € 15m bonuses = € 78m in total for Milan.
Honestly, I think u‘re missing the point. There’s nothing smart in having 51.3m now instead of having 63m right now.
Even if I want to build a scenario where I say we’ve a lower fixed amount n more bonuses, then I’ve to discount the future inflow of bonuses cause in a year's time it’ll be worth less than today. The financial-mathematical discounting completely cancels out the effect of us paying less to Alkmaar now.
It's a shitty deal for us, whichever way you look at it. No excuses.