I'm not the one you replied to, so I don't know what they mean specifically about the "tradition of Sun", but Bryan worked at Sun where he helped create DTrace

I'm not the one you replied to, so I don't know what they mean specifically about the "tradition of Sun", but Bryan worked at Sun where he helped create DTrace. After the Oracle acquisition, he left to join Joyent as VP of Engineering and then CTO. Steve was COO of Joyent. And I have heard similar comparisons between Joyent and Sun.