Perhaps they want a downforce tunnel in the other side pod, or they got points if both sides form safety crumple zones for the driver, or "it looks nicer if symmetric"? The last might go with the "the team desired the retro-look the bodywork that was styled along the theme of the Lotus Type 49 from 1967".
I don't think you read the results correctly if by by-pass air you mean case-2. The mass flow rate was increased by 206% with ducted-case 4 which "offers the highest cooling air flux to drag ratio of the tested configurations". The unsealed case- 2 was a 49.4% increase over the original.
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