According to TKC: The “physical” stat may not refer to overall power, it may just instead refer to pure brute strength, which is a factor in martial power but not the overall picture.
However we are still waiting on more context. Speculation is that Hara still wanted “100” to be the maximum stat, so he downgraded Moubu to 98 make room for Shibashou.
Either way Shibashou power creeping the martial tier list seems heavily likely atp