Of course it's meaningless. It's mainly about whom the fans like enough, and thus deem worthy to be transfered to Turin.
If you like him, he is Juve material. Regardless of what material's already in the squad.
Juve material, when a fan thinks he is good enough to be in(or to be transfered to) the team he is considered 'juve material'.
That's all there is to it, I think..