From Kamiyagawa's perspective, if the Footselling Granny truly helps fight against the Earth Spider as agreed, then all would be well.
But if the Footselling Granny is only trying to delay things by coming up with temporary solutions and ends up siding with the Earth Spider,
that wouldn't be too much of an issue either.
Given that he had the Refined Corrupt Grease, even if the Footselling Granny bonded with the Earth Spider for all future endeavors, he was confident that he could deal with her forcefully right in front of the Earth Spider.
The worst-case scenario would just be—
After forcefully replacing the Footselling Granny, he would have to wait a bit longer for the effects of the grease on the Earth Spider to wear off before he could slowly start dealing with the giant spider again.
He was willing to bet on whether the Footselling Granny would switch sides as a trade-off for more time.
After considering the pros and cons, Kamiyagawa could bear this cost.
