There's been a shake-up in Rob Lowe's Lyon's Den. Series creator Remi Aubuchon has been asked to step down as showrunner due to alleged creative differences with 20th Century Fox TV, the studio behind NBC's Sunday drama. He will be replaced by Den scribes Kevin Falls and Dan Sackheim, who have been promoted to co-showrunners. Strangely enough, all of this comes down just three days after The Practice beat Den in the ratings. All together now: "Hmmmm..... "