The Hartono brothers shouldn’t like that ^^. Why did you let such a low buyback option to be messed up? After all, the player wasn’t that cheap for one from the second team from Madrid with 6 million euros?
You can now see this more and more that top clubs do not lend their players, but sell, but in return they have a low purchase option.
Examples of this are now Paz, but as far as I know, Fran Garcia also came back to real. And at FC Bayern you can find circles, Hoffmann (in front of Schalke change), Früchtl (before Lecce Change) and Nianzou (although this would not be really cheap).
From the point of view of the top club, this saves the content and, when it comes to the hoped -for development of the player, has an ideally cheap option to get it back, from the perspective of the receiving club you get a player that could only have been borrowed or that the otherwise much more replacement would have cost, and has the possibility to remove a transfer gain and, from the point of view of the player, the variant is probably also more pleasant to stay with a club Better for development than a Leiodyssey ala Ødegaard.
And to talk about PAZ now: without this low RKO, he would either not have been available or at least much more expensive, so you now had a (very) good player for a year and also turns into 3 million transfer plus.