I can only think of one way this could be a positive (correct me if I'm wrong).
Getting rid of the obligation for Madrox to pay the £20m back to Sunderland means that, if someone just bought Madrox, they wouldn't be faced with £20m they need to repay. Of course, someone could buy Madrox and cancel the debt themselves, but it would look bad for the fan base if that was one of their early actions, they'd be better getting the current owners to do it.
So, someone buys Madrox instead of Sunderland. That gets rid of Donald and co, it also keeps FPP around (the loan from FPP is to Madrox). They'd have to agree to it, but if they aren't happy at how Donald is doing, they might be perfectly happy for someone else to take it on and have a go. If its someone who could afford to fund a push to the championship they might be happy enough having FPP who might give favourable loans if they see we're being well run, and who might take us on for a good profit if we get into or near the Premier league.
In theory this would be good for everyone. Not saying that's what's happening like, but it's a possible positive spin on this move. It's a shit move if you buy Sunderland and suddenly there isn't £20m coming in, but it's canny if you buy Madrox.
Some financially minded people might be able to tell me this is all wrong! And to be honest I don't know why anyone would leak it in that case, but it's the only possible positive scenario I can see