Neymar, like you mentioned, is the polished version of Tello. The kid is 20 years old....I don't know about you but I don't see other 20 year olds doing what he does. You take away Villa's and Pedro's workrate and I'd take Neymar any day of the week, he just offers so much more. Creativity, link up play, smart runs, deadly finishing and THE ABILITY TO TAKE ON AND BEAT HIS DEFENDER. Villa is fucking harmless 1 vs 1 and I don't think I've seen Pedro beat a player this entire season. Our wingers play wide to spread out there parked bus, but when they only attract 1 defender b/c they know they are harmless....well ya, not too productive is it. Villa is world-class and he will find a way to score goals, but that doesn't mean someone else couldn't do better.
If Neymar gets out of the draining Brazilian sun and gets used to our conditioning, the sky is really the limit. Imagine Neymar with Pedro, Villa or Sanchez's workrate? Regardless of what people think (mostly due to people judging him based on his haircut, quite ignorant) Neymar is not a douche who would expect people to cater to him at Barca, going to Barca would ground him if anything. Just look at how he speaks about Messi.
We've spent 45mil + Eto on Ibra and 40mil (way to fucking much) on Villa, two players who were basically 28 years old. Buying a player like Neymar, who is great already the way he is, with that kind of potential....it's just a no brainer for me. I've always loved Villa but his overall form has disappointed me although he's gotten the job done for us at times....at 31, post injury....I wouldn't be against cashing in and putting it towards the future. Messi and Pedro are old enough now to be considered our "experienced" forwards.