But the question is why, why would PSG want to start the negotiations earlier? They are not in dire need to sign Dembele this window, if they wanted him (I doubt it), they could have easily waited 6 months and get him for free. Dembele is probably a nice to have player for them, not a must have player.
The fact is Dembele's market value and appeal have plunged so much that not many clubs want him.
Imagine this:
Another agent, not Sissoko, who IN EARNEST looks for solutions is being informed that the club wants to sell the player after they failed to find an agreement.
He offers his players earlier, let's say 2-3 months ago, to clubs the player likes (like what Moussa did offering Dembouz to Chelsea, UTD, PSG, the last minute of the window)
PSG thinks it's an interesting opportunity, they agree terms with the agent
Then agent informs Barca that there is an agreement on personal terms with PSG.
Allemany picks up the phone and contacts Leonardo.,
And that's how negotiations officially start.
PSG would not have done anything different than what they did now,
the only difference was the time left that was dictated by Moussa's PURPOSEFUL INACTION
Players aren't going to just look at what other players at barca are getting paid but also what the club spends which includes the transfer fee.
Analogy :
As an employee company tells me I have to drop 30k off my salary for for the next 1-2 years and might hit close to what I'm earning now after the 2nd year of I hit all. My kpis, yet they also tell me I'm one of the best in the business. I think OK that's cool I like this place I'll think about staying even though I know I could probably get more elsewhere.
Company then spends 20m to purchase a machine and employees foreign workers and half my current pay. I'm not going to think ah that's cool. I understand it, I'm going to think you mother fuckers lied to me, you obviously have enough money to buy the machine you could of paid me instead.
But they didn't!
The analogy is false.
Barca didn't pay a single penny now for all 4 players we got. Installments in the future and future buyon clauses
That's perfectly in line with the 'We don't have money now' they told him