The latest formula that Arsenal are studying to get Coutinho

Philippe Coutinho was one of Barcelona's executioners in one of the rockiest days in the history of Barcelona. The Brazilian, on loan at Bayern Munich, contributed to the debacle of his club of origin and remains alive in the Champions League, therefore his future will not be resolved for now.
There is a lot of uncertainty surrounding Coutinho, whose most likely escape route seems the Premier League. There, the team that has moved actively and formally for the player is Arsenal, who aren't giving up despite the negatives from Barca.
The Gunners already offered a swap for Guendouzi that the Barca board rejected. Neither do they like the French midfielder, nor are they interested in letting Coutinho go for little or no money. The need that there is is to balance the books.
Now the English press is saying that the London club are considering another approach for Coutinho. On this occasion, the new formula to sign the ex-Liverpool player would be a loan with an option to buy.
This is the deal that was already reached with Bayern last summer, but the Bavarians didn't execute the clause to keep him. Now 'Sport' states that Barcelona are more desperate for money and just want to sell him. Another thing could be if the purchase was compulsory.