Bhante Analayo talks about his personal encounter with Dhammaruwan (download friendly audio recording) here:
It begins at around 12 minutes (talk starts at 6:27) and again at around 55 minutes, followed by the recording of young Dhammaruwan chanting the Dhammacakkappavatanna Sutta (SN 56.11) during the intermission at 58 minutes.
There is also a discussion concerning Bhante Analayo’s new book here Livestream interview with Ven Anālayo April 20 - #24 by Linda