Sevilla did not want to keep or buy Nasri, for reasons on and off the field, as well as his price. He had a good autumn, an awful spring. I am not sure why Sevilla haggled about Jovetic, because his price was not close to be as expensive as Muriel (for instance), I think it is also down to what Berizzo prefers (if the board asked him on his opinion between these two players). Despite Jovetic's great spring, I think they were still unsure what kind of an investment he could be in the long term, hence why Sevilla never went all in for him; while splashing the money on Banega, Muriel, Kjaer, Pizarro, etc.
Considering the 'La Liga is losing strength'... well, it is not wrong to claim that after Neymar gate. Real and Barca have weaker squad depths this year, no doubt. And other teams in Europe have taken huge important steps forward, which has made Champions League more unpredictible this year
Although, Real's decrease in depth is deliberate, and instead they have planned for a long term approach. Evidenty however, the strength of La Liga is that the success of Atletico, Valencia, Sevilla, Villarreal, Bilbao, have never been based on emuating Man City, Chelsea, or any other overly rich team. Atletico's transfer ban doesn't stop them to strenghten their squad, so don't let that fool anyone. Griezmann is staying, VITOLO(
) is a great addition to their squad, and they did not go for 100% in the Costa negotiations, because they are unsure about how Costa's physical condition will be in January, since he is practicing on his own. So they are playing some kind of a wierd tactical game with Chelsea. They believe that the negotiations can might as well continue in January, it is not like Costa will be fully fit when he arrives either way. It is a bold game, and big risk that Costa ends up being the big loser here, if the ultimate negotiations falls down in January.
The dip La Liga may have in the future however, or this season, - as well as how long the dip might last - is purely based on the top (Real, Barca and Atletico). If the La Liga top decline, then naturally the league won't dominate Europe in the same manner, as all these 7-8 years (and for most of the 21st century). But the middletable teams will most probably remain around same level as they are now (both domestically and in Europe), in which the distance between the top and middle could become much more closer in La Liga, as it was around 2000-2007, as it has been in the Premier League post Fergie retirement (as the english top somehow became 'up for grabs').
It's just unbelievable how deluded you are. Did they brainwash you or something like that because you're actually a good poster on any other subject.