We dont know the means of Kaidos escape. It appears as though after his defeat after Rox death he flew away before capture and we don’t know what his circumstance of escaping vegapunk was. (He wasn’t in impel down is all we know) And the people of Wano will go along with it if Momo says there will be no execution. Momo has been hurt due to this execution policy. This execution policy was what created orochi and kanjuro. I think Momo ending this circle of violence is going to be his first decree to show his maturity.