Shou and Daimon's feet are closer to being the same size as Yashiki's, but still smaller!

It is worth noting that Mashita did not conceal what little he knew maliciously here, rather his instinct told him it would be irrelevant and only confuse yashiki (also he didn't hear anything besides “fools” lol). If yashiki knew his former self was at the police station he would investigate it needlessly and waste valuable time. Additionally this new chief was corrupt and took bribes from criminals and was likely responsible for getting Mashita fired over sexual harassment claims. He knew from personal experience that it would go nowhere.