If he is disqualified, which isn't likely, you could block his registration.
If the company collapsed due to severe negligence, then again you could block any registration.
It would probably cost you more inlegal bills though than it would better outbid him.
You could always quuery with the liquidator that they need to check if all figures add up, if they dont, which they dont often do, they wont sell it to him anyway.
If however, it is just a plain and simple company gone south, the directors are well within their rights to buy it, and quite often do, usually before the company folds.