I went with the I don't know option, only because I don't think he will be 'shut down'. I think Kelly may improve slightly, but will most likely continue to consistently produce with however many minutes he gets.
Like others, I would love to see him be a bit more aggressive, but that seems like one of those traits one either has or doesn't. If he somehow does break out of his shell, look for him to be productive because that would mean more minutes. He really does have all the tools, just seems afraid to use them.