As you say Neymar was the best vs Sevilla. I was one of the people that wanted him to join us since 2012, because I really think this guy offers a lot of things we were missing: dribbling, ability to play in the winger AND cut inside, shoot and cross. And he has the "magic" trait as well as Ronaldinho, that will give the team an extra boost when playing at home and the spectators exclaim those "Oooooooooh".
And maybe, this last point is the most crucial, as it will help to quickly galvanize the team and make him an important piece (to me he was also critical against Valencia).
The only problem I see is that in certain moments, he opts for a pass to Messi when he could finish the play himself. He needs to find his space to be a bit more selfish in the last third. No doubts he can do it.
A stellar signing of a player that I wish could spend here lots of years with Messi, they will create something unique when they get to know each other more.
PS: The problem is our midfield. Xavi should never be a starter, he's playing pathetically and in terms of defense, he's a hole in the team. The same applies to Iniesta. We've been waiting for him more than a year now, he's unfit and underperforming and I really think Cesc should be the starter and Sergi Roberto deserves a lot more time in the team. Also, Busquets is injured and should undergo surgery if he wants to be 100% again. To me Busquets-Xavi-Iniesta are the ones that unbalance the team right now. They add a lot of possession but made us very vulnerable at the back, also because we play with 2 offensive sidebacks.
We need to find again a balance between possession, chances, risk and safety, and if it involves making some changes in the middle, Tata should try it.