No it wouldn't, that is tantamount to me being scammed,. I offered him a settlement of $1250, that is what he will have to pay.
Money is fungible. What does it matter if you get $800 from him or $800 from someone else or $800 from him indirectly through someone else. Obviously you are willing to settle for less than $1250 otherwise you wouldn't be offering it for sale.
The problem with shakaru buying it would be that it would be really unfair to the rest of his creditors. If shakaru somehow gets hold of $800 it should go directly to the fund for a fair repayment to all creditors, not just to buy one person out.