User blog comment:Fedora Lord Para 348/Useful Notes: Tsumichi vs. Sayaka/@comment-25993979-20150313003758

Tsumichi may not be brilliant, be he is a stratagist. Surely he wouldnt be that blind as to not see the soul gem. He would know that Sayaka would have a weakness, and try different things, leading to the soul Gem. Its certainly possible.