I'm just trying to get my head around this. If I've got it right, SISU are suggesting that CCC were prepared to enter into a conspiracy with them, to falsely lower the value of ACL to Yorkshire Bank, by withholding rent by secret agreement. On this basis SISU think the mortgage could have been bought from Yorkshire Bank for £2m - £5m.
As someone who worked in banking for a while (admittedly in consumer debt rather than commercial debt), I don't think that plan holds much water. In my experience banks don't sell the debts of customers thought to be approaching financial difficulty - it's only the customers actually in financial difficulty (i.e. not actually paying their bills) and where all other collections avenues have been exhausted, that they will tend to punt on at a discount.
So for this to work ACL would have to stop paying the mortgage, but then there's no guarantee what action YB would take. They might have gone down the admin route and looked to get hold of the stadium and land for themselves, for all we know. And even if YB did decide to sell the debt, there's no knowing for how much, or to whom. That £2m - £5m figure is completely plucked out of the air, as far as I can see.
If it was a plan - it was a pants one from where I'm sitting.
So maybe I've misread it, but I can't see how this is much more than the usual bs we've had from SISU, designed to muddy the water. It'll be interesting to see what evidence they'll put forward, but if it's just "he said, she said" stuff with no corroborating documentation, then I can't see this getting too far. We'll soon see.