A company has to be able to operate on its own. Look at BRK; they don't fund every last bit of debt for all of their holdings. They will pull profits from compa

A company has to be able to operate on its own. Look at BRK; they don't fund every last bit of debt for all of their holdings. They will pull profits from company A even if A needs money to e.g. invest in operations if they can get credit at a decent rate. They may put that money in company B which has more growth potential and is not in as good a position to take on debt to do so.