I believe it is unlikely for anyone to detect or question 6 cm tibias, even at a swimming pool.
The primary purpose of segmenting it into quads would be to reinstate the 0.8 tibia to femur ratio since deviating from this ratio has been linked to potential health issues in the long term. It also helps in reducing the risks of ACL injuries, ballerina feet, and such conditions resulting from a 6 cm tibia.
However, I would recommend a minimum quad of 3.2 for the tibia and 4.0 for the femur to maintain the 0.8 ratio between the tibia and femur post-surgery.
