As described I don't see how this would be a compensation event. I assume that the original quote was followed through to its conclusions and "implemented" under the contract. that would mean that the time and cost effects would be full and final. Only if the quotation was based on stated "Employer assumptions" could it ever be revisited, but even that would be a new compensation event.
You have said it is option C, so the other thing to remember is that the target will have been increased by the agree amount, If the Consultant spent less or more than the agreed amount, they get paid that, but that will either increase or decrease the pain/gain share at the end of the project accordingly.
You have said it is option C, so the other thing to remember is that the target will have been increased by the agree amount, If the Consultant spent less or more than the agreed amount, they get paid that, but that will either increase or decrease the pain/gain share at the end of the project accordingly.