Sun shipped could which _could_ link dynamically to GPL code. The problem with this "GPL infects across dynamic linking" argument is that you are therefore try

Sun shipped could which _could_ link dynamically to GPL code. The problem with this "GPL infects across dynamic linking" argument is that you are therefore trying to make the claim that whether or not kadmin is infected by GPL code is dependent on whether there exists another library which is not licensed under the GPL. This gets perilously close to claiming copyright infringement, with the added wrinkle that the simplest way for someone to take code that was previously claimed to be GPL infringing is to create and ship a new library which is ABI compatible. So something could be a GPL violation, and then when a new library ships, et voila!, it's not no longer a violation. And something could orignally clearly not be a GPL violation, but when a new library ships which has a dependency (implied or explicit or even conditional in the case of an optional dlopen) on GPL code, now that proprietary binary can now run with GPL'ed code in its address space.