He's physically done for.
I don't doubt his class on the ball. Xavi probably still passes better than 90% of LaLiga, but the problem is the intensity they can do it with. You can have the best technique in the world, if you're too slow, you'll lose the ball. We've seen that even with Messi in our last years how often he started to lose the ball in comparison. Neymar is even worse now, he lost focus on football long ago, prefered a big paycheck and playing counter-strike.
Now he's in some kind of mid-life crises, knows his football clock is coming to an end and tries desperatly to relive his best moments before it's too late. Well, guess what, should have thought about that a bit earlier. Good comeback stories are a big exception in football, most of them result in failure, because the mind plays a trick in thinking he's the same player that left and that leads to impossible expectations, which result in frustration in the end. Ronaldo at United is a perfect example.
Further, he'll destroy the team's unity by taking all the spotlight for himself. We have a young team that grows together. The last thing they need is a black hole that sucks in everything around. His name alone will make everything about him again, increase the pressure to see him on the pitch. Yes, it'll be fun the first 2 weeks and after? The big hype will be gone, the reality will set in and his name will dominate in all topics for all kinds of reasons, creating unrest.
Even now in Brazil, he looks older on the pitch than Modric. How do you think it'll look in LaLiga?
Bring him, Messi and Suarez back for one farewell game in the Nou Camp Nou. That's the only time he should play for Barca.
