Do you think they are going to hold it ?
Uh...what all of the creditors will do with their money when they get it back is unknown, but it is impossible that all of them will sell it instantly which will cause a mega-dump, some of these creditors will hold, while some will sell it, and that will tell the type of dump that is to come, another thing that will determine how bad it is going to be is how the money is going to be paid, would all the creditors receive a lump-sum payment of their money, surely people will request for alternate means, all of these will slow down the pace at which people will liquidate and reduce the effect on bitcoin price.
Some will choose the later payment option; some will want a cash-only payout; some will accept the mixed payout. And once people do finally get their bitcoin, there is no reason to assume that everyone will dump all of it anytime soon.
This snippet is from this news, it is from a month ago, but a good read on the topic.
https://www.coindesk.com/markets/2022/07/14/no-mt-gox-payouts-arent-going-to-torpedo-bitcoins-price/