And weariness could be playing a part, too. Damian McKenzie and Aaron Cruden were both ineffective against the Sharks after spurring their side all season.
The playmaking pair would be forgiven for feeling fatigued, given McKenzie has played all 720 available minutes and Cruden has missed only 35. But fortunately for Rennie's men, after they clear the Highlanders hurdle, the remainder of the campaign provides plenty of opportunities for rest and recovery.
The Chiefs will soon enjoy their second bye and, after hosting the Rebels and visiting the lowly Waratahs, the international break is looming. While they will be sure to lose a handful of players to All Blacks duty, a month without match action for the majority of the squad may not be the worst scenario as Rennie plots a tilt for a third title.
With an opportunity to recuperate and with time for reinforcements to arrive, the Chiefs can then set their sights on closing out a tricky end to the campaign when they take on the Crusaders in Fiji before trips to the Reds and Highlanders.
The relentless form of Todd Blackadder's side - winners of seven in a row after dropping their opener against the Chiefs - means the front-runners will be allowed no slips if they wish to secure home advantage throughout the playoffs, a factor that proved crucial in their first two championships.
But having in recent weeks illustrated an equal aptitude for grinding out wins and blowing away inferior opposition, there's no reason to think a squad refreshed by a few free weekends will struggle to end the season the way they began.