Grigor is lame. He obviously did copy Federer, at least to begin with. The similiarities are too striking, there is no other reasonable explanation. He copied him so much so that he even has Federer's deficiencies on the backhand side, without benefiting from Federer's hand eye coordination and movement. Late arm straightening, really high takeback, too much wrist, etc....The result is a very weak ball that is regularly left short. Really weak.
That was my impression from the matches I have seen of his, so lately I have avoided his matches. The Federer impersonation creeps me out.
winter makes it hard to practice serving. off again on again til spring....sigh