Copyright vs Trademark

It's not a copyright issue, it's a trademark issue. Anything resembling the trademark can be considered an infringement, and it's up to a judge to decide what is.

You're saying copyright but it's more likely to be a trademark issue.

This would be trademark law if anything, not copyright.

Could that be treated as a trademark issue rather than a copyright issue?

logos aren't just trademarks, they are also themselves copyrighted, and if he never explicitly gave up the rights...

This would be trademark (or possibly trade-dress, or even design-patent) infringement, not copyright per-se.

There's not just trademark, but also copyright. Somebody designed those logos. Does this fall under fair use?

I am not a lawyer, but I am nearly 100% sure that what you are talking about is trademark protection [1] rather than copyright, people get these wrong frequently. As far as I know, you can enforce your copyright completely arbitrarily.[1]: https://en.wikipedia.org/wiki/Trademark#Maintaining_rights

There's copyright law and trademark law. Copyright law might be ok with something but trademark law might ban it. The ban takes precedence.

That sounds a lot like trademark infringement, not copyright infringement.