Those were pretty lopsided but sometimes being #2 wasn't that bad at Lotus: Clark and Hill, Andretti and Peterson.
Have to agree with Clark & Hill...the dream team, but remember Jim was well established within the team and although Hill had won a championship elsewhere, his key role was development. This was also true with Andretti later on, Peterson was well suited and carried on the 72 for quite some time as #1....
Mario, meanwhile was waiting for the chance to go back to F1, having USAC and Indy fighting in the backdrop...asked Chapman for a permanent ride. Peterson was unhappy with the type 76 failure and was off to the Tyrell P34 project.
It was only later when Mario was clearly suited to lead the efforts, by having brought the types 77 & 78 ground effects design forward. Peterson rejoined, and by the introduction of the type 79 was regarded as coequal with Andretti.