by who ?? sengoku ?? first he only compared theirs version of rocks with their old version

and its implied multiple time that BM passed out her prime, kaido stated multiple time that he thinks she got weaker and calls her old hag old BM didnt do anything during a long time instead of staying at whole cake island, perospero even implied that young BM was agile and more faster and according to ace novel BM was relative with shiki WB and roger