Kobe piled on 12 tries on Saturday to win 78-19 and maintain second place on the standings.
D-Rocks, who are without the injured Wallabies back Samu Kerevi, are unravelling, with six straight losses after they had made a promising start by winning three of their first four matches.
A contender for the vacant All Black coaching position, ex-Wallabies coach Rennie's charges have scored a staggering 49 tries in their last six matches.
Bernard Foley's Spears Funabashi Bay continue to lead the way after gathering their ninth win from 10 with a hard fought 28-10 defeat of Yokohama Eagles on Sunday, although their inability to secure a try-scoring bonus point against the league's bottom-placed side has trimmed their lead on the standings to two points.
Their next engagement after the upcoming bye weekend pits them against Saitama Wild Knights, who returned to winning form in a confidence boosting 66-19 demolition of Mie Heat.
Aussie-schooled Japanese internationals, centre Dylan Riley, back-rower Ben Gunter (two) and second-rower Jack Cornelsen, each scored tries.
The struggles of Brave Lupus Tokyo continue, with the defending champions crashing to their fourth defeat in a row after a TJ Perenara-inspired BlackRams Tokyo claimed a 33-14 win in the opening game of the weekend.
Brave Lupus face Tokyo Sungoliath next in the Fuchu (western Tokyo) derby, and their close rivals warmed up by crushing Shizuoka BlueRevs 57-24.
Steve Hansen's Verblitz recorded their second win on the bounce, prevailing in a thriller against Sagamihara Dynaboars 31-29.
