Quote - I'm somewhat confused =/

I supsect this was caused by someone answering a question that wasn't asked with information that didn't apply to the question that was asked.  

Quote - Why would there even be an issue if he was using 2d rendered images of the characters?!?

There isn't an issue.  

Quote - Is this not allowed?!?

It's allowed.  

Quote - Are renders not ours?!?

Of course they're yours.  

Quote - I can understand wanting to give credits, but if using the renders causes some type of legal issue, that just "scares" me.................

While you can never be completely sure that there won't be legal issues, you can significantly reduce the likelyhood by be diligent about the licenses you have for stuff you use.