Some players fall out of favour at their clubs, and they are most likely not on good terms with the head coach. It's impossible to play well under a coach who doesn't like your game structure, as I've witnessed numerous times. Joao Félix is one of the good players who was loaned to Chelsea; he did everything perfectly except get a red card on his debut. Under Diego Simeone, the Portugal international lacks regular game time at Atletico Madrid, which would complicate matters even more if he still struggles to adapt. With time, things will get better for the player.
Joao felix performed moderately at Chelsea last season but because majority of the players were having a bad season it then looked like he was that good but he wasn't. If he impressed Pochettino at Chelsea, he would had kept him but he has analyzed his game and he didn't impressed him that's why he let him go before resuming the job officially as the head coach of Chelsea. Pochettino couldn't have worked with Joao felix style of playing and he knew that which is why I love Pochettino with all the decisions he has taken since accepting the job offer to coach Chelsea.
We'll see how far Brighton will go to keep this player if Chelsea come back with their previous offer. I saw Chelsea did not just give up even though the offer was rejected, and that proves they really want this player.
Chelsea's eagerness to bring in the players they want is natural, because they have to improve their performance, and one of them is by recruiting several new players.
Actually last season they also did not lack players who had good quality, it's just that it was a difficult season for them so the players could not show the best of their game.
Chelsey are showing signs of desperation and the Brighton teams has noticed this that's why they're insisting on their initial offer. Chelsea aren't showing the Brighton team that they'll be willing to pull off the deal if their demand isn't been considered but only getting rejected and sometimes it looks automatic (the rejection). I thought Chelsea had one of the best negotiators at the movement, what are they doing that the Brighton side is messing with the heads. If they can't get the Brighton side to lower their demand, they should move on to other options available in the market.