Ironically, Knudsen found himself drumming alongside Michael Hossack, whom he had replaced all those years ago. Of the multiple pairings of Doobie Brothers drummers over the decades, Knudsen's time-keeping partnership with Hossack lasted the longest.
Despite a past replacement, Knudsen ended up playing drums with Michael Hossack, who he had previously replaced.  The Doobie Brothers have seen many drummers come and go, but Knudsen and Hossack's partnership was one of the most enduring.