It's a bit like taking over someone's lease for a house mid way through...
If there is damage when you take it over, you better ask the person you're taking over the lease from to pay for it, cos else it's gonna be blamed on you and you'll have to pay for it...
The same translates to buying shares with my proposal - you better inspect what you're taking on, because there might be costs associated.
Then if the remaining investors pay the debts, they've also lost all the money they invested.
Where do you draw the line for investors responsible? Anyone who's still in? Whoever was ever in?