If the roof had been put on around that time, quite a few tiles that are the same type as those with inscriptions had to be found but, in view of their absence, it is considered that some of the tiles may have been added to address an emergency situation due to some disaster or another.
もし、この頃に屋根葺が行われたとすれば、銘のある瓦と同種の瓦が相当数出てこなくてはならないが、それらの資料の得られないところから考えると、何かの災害によって応急的に一部の瓦が補足されたのではなかろうかと思われる。