He proved leadership in Oct-Nov 2015, but he decided it was enough for now and just let Messi do it all.
I don't fully agree.
Neymar is extremely hot and cold player.
For example, we all know that he CAN play on a level where he was the 2nd or the 3rd best player in the world.
But the problem is that this is how it goes with him:
1. he plays in a god-like mode for 2-3 Months
2. then he gets tons of praise
3. then he fells in love with himself and in love with that praise
4. and then he starts his stupid period of play like in Spring 2015 and Spring 2016 with keeping the ball too long, dribbling for no reason, trying illogical tricks, provoking the opponents even more, getting into fights easily, scoring 0 or 1-2 goals in 3-4 Months etc
Then, after some time of being a crap, he somehow goes back into a god-like mode, and then the same story:
1. he plays simpler, faster and more efficient
2. he plays awesome for 2-3-4 Months
3. he gets tons of praise again
4. he loses his head again because of the praise, fells in love with himsfelf and again changes his style to ballhogging, illogical dribbles and decisions, playing too slow, provoking opponents on purpose, fighting with everyone etc
So, CAN Neymar play at the highest level?
= YES
Can he do it CONSISTENTLY over 1 season, or at least long enough so that we don't suffer as a club?
= I don't believe in that anymore. He is just too hot and cold (he is not 19 anymore, either)
About him being a leader:
Can he be a leader?
= YES, sometimes
Can he a be a leader on longer periods, like 2-3-4 years, where he would stay calm in his head all the time, being both the leader/example (like Ronnie/Messi) and a great/decisive player whenever we need him?
= imo, one big NO
The way how I see him is:
= he is a perfect "helper" to a guy like Ronnie or Messi.
He can work that way. Messi or Ronnie would take the responsibility, and Neymar will follow them and from time to time offer insane periods of his game.
But him as a one-man leader for the best club in the world, Barca, I just don't see him at that level.
For Barca, he just goes into extremes too often from god-like Months to Pedro-in-his-worst-days-mode, as a player.
Currently, I can't rely on him that he will be in a god-mode when we need him the most, (in the future) in April and May against Real, Bayern and Atletico in CL quarters and semis.
Maybe he will deliver, maybe he won't.
He is extremely unpredictable.
A slightly too unpredictable to be a key player at Barca, and to be a player on whom we could always rely, like or Ronnie or Messi in the last 10-12 years.
How many times has Ronnie disappointed us when we needed him (once in 8-10 matches, at most).
Also, as a Barca's leader, he just goes into too many fights, incidents etc. (And no, it is NOT because he get kicked all the time. All other top players get kicked all the time also, and Ney is the one with the highest amount of idiotisms and fights with everyone around the pitch).
So again, imo, for Barca's future, we will either need a new playmaker/leader.
Or we will need a guy like Reus or someone one day who will share at least 50:50 responsibility/leadership with Neymar, cause there is NO WAY that Ney could lead this club alone (or being a key player alone with way weaker players around him, like in a Brazilian NT).