Well, he's not coming back unless he explodes over the next two years. And if he does then two things:-
1) 30m (-8.4m, so 21.6m) is OK.
2) A 60m buyout clause (of which we would receive 40% so 24m) would be a very realistic sale for Porto to achieve given Porkchop* league moves to EPL.
Only issue in the buyback really is our financial struggles which would make it very realistic that he both does very well and that we can not afford to bring him back
Wish guys like Ferran and Ansu had the same desire to prove themselves outside.
BUT
Just to add. I do think the buyback is a little high. For reference Madrid sold Morata for 20m and bought back for 30m. Then sold Mariano for 8m and bought back for 21.5m. So roughly 10m increase, which seems a fairer increase.
So wouldn't call it a great deal, but more of one that brings us a little cash today, with a potential problem tomorrow if we want to bring him back before our financial problems are solved.
The buyback clause is clearly not seen as that fantastic inhouse as Barcelona official releases do not mention the amount. Thankfully Porto are on the stock market and always release all numbers clean by the book (even if Pinto himself is dirty AF).
*If anyone is offended with the porkchop then let me know. I will change it to Salted Cod.