Yes, he can send resume to Agent

-- congratulation for the stable and nice job! Tell him enjoy it. As long as you do not give him presure, he should be happy with what he is doing.
-- If he (and YOU) want him to change, then, actively search job opennings on large companies website, and large job website, and Agent.
-- He will will know which Agent is good after work with them for a while.
-- Only jump to the company he wants, otherwise, stay and enjoy life.

Thanks!