There were many written interactions between the two.

They also were clearly different personalities. You can read the posts from both at Bitcointalk.

And the idea that SN was both just doesn't fit at all with how SN was.

SN mentioned for example that the license of the Bitcoin client should be the most permissive one because if it wasn't then other people would implement it with that license, therefore duplicating work.

SN usually was very efficient and didn't want to waste efforts in anything. Creating a whole different persona makes no sense.