Lelia Masaga and Tim Nanai-Williams could thread themselves through the eye of a needle - and their support play is excellent - but they need to sharpen their peripheral vision and be more aware when to pass or take the ball into a tackle after making breaks.
A by-product of taking more tackles would have been a reduction in handling errors. Rennie had thoughts on Masaga and Nanai-Williams before they flew to South Africa last night.
"Lelia looks good when he finds space, but a bit of draw-and-pass is on the agenda for him. I don't mind players like Tim celebrating with dance moves ... after they score tries."
The worst panic attack in possession came when hooker Hika Elliot replaced Mahonri Schwalger in the 60th minute. The Chiefs endured 14 phases of Force attack to get the ball back, then Elliot threw a pass over the sideline rather than going into contact in the next movement.
Having 14 penalties go against them and conceding 18 turnovers at the breakdown meant the Chiefs faced a night of attrition which they can ill afford to repeat in the next fortnight.
The upside was their relentless defence. A concertina-like spread from the breakdown means they rarely commit too many defenders.
"Our defence was crucial," Rennie said, "especially seeing we gave away a lot of penalties and had some issues at scrum time. Our scrum was dominant but the interpretations are always different. We're seeking feedback."
"There was a thought Sona [Taumalolo] was not keeping his hips square to the target," captain Craig Clarke said. "But it was hard to hold him back when our scrum was so dominant."
Lock and No 8 Kane Thompson is returning home with a neck injury. He is expected to be fit in a couple of weeks. Fritz Lee replaces him. Prop Toby Smith was not considered with a calf injury on Friday but should be fit to play this week.