Detonation can be activated without any Kuriboh or Kuriboh tokens on the field.
Multiply tributes Kuriboh as an effect, not a cost.
Kuriboh released for Multiply need not be on your field.
Kuriboh released for multiply need not be a monster.
You guys see it yet? Amazingly fun 3:5 Trade?
Yes, according to the OCG wording, this is all possible.
Makes no sense whatsoever why so, but you can.