Well there's no need to be a dick about it.
I do have to ask you though, as neutral, can Ian prove legally he made the symbol? Does he have documented copyright? You gotta do these things.
I believe since Will paid whole-heartedly for the band logo to be created, he has creative rights, and owns this logo. If anyone else were to use it to advertise their band or sell it on merchandise, they can be using it illegally, and would have to pay royalties to the owner of the logo.
Just my two cents, since I design logos for people as well.