I looked though BCNext's posts and also Satoshi and you can't help but see a strong language correlation between the two.
What I thought would be interesting is to find language similarities and differences. Some are hard to place your finger on and are more about a certain tone or voice but still they can be discussed. I think it has value cause if he/she is the same person then it has ramifications for Bitcoin whether you like them or not.
After a short read though I noticed a few things.
1) Both often start sentences with I.
2) Both use spaces after punctuation.
3 Both have a very educated and well spoken tone.
4) Both want to be anonymous.
5) Both use lists just like this one often.
Its a hunch but I recon they are the same person. I wonder if there is anyone on here with forensic skills as language identifying or have their own opinions on similarities or differences. list them maybe...
Satoshi posts: https://bitcointalksearch.org/user/satoshi-3
BCNext posts: https://bitcointalksearch.org/user/bcnext-152600
Yes. He superceded his own invention in Java.