From what I understand the creditors get a proportion of the assets based upon what they are owed. So for instance if Genii are owed £100m, Renault owed £30m and Kimi £20m, then Genii would get 66.7%, Renault 20% and Kimi 13.3% of the assets. However if Genii had paid to run Lotus out of their own pocket then they would not be owed anything. So Renault would get 60% and Kimi would get 40% of the assets if the team were wound up. But you are correct there is some preference for unpaid wages upto £800, taxes and the administrator's fee over normal creditors. I'd be interested to know if Kimi's is considered to be an employee or a supplier? I somehow doubt he pays UK income tax or national insurance contributions.
I would hope it wouldn't come to it, but if the worst did come to the worst, then Lotus would probably end up in administration (voluntary or through a court order), in which case they could / would continue trading until such time as the administrators found a buyer.
If a buyer couldn't be found, then it's the administrators job to realise as much money as possible from the company's assets, and then distribute the money to the creditors.
Secured creditors will get most of the money - this is anyone with a charge over assets of the business. It appears that Proton still has a charge over the assets of the business, including all plant and equipment, work in progress etc. - the whole lot by the looks of it.
Next in line are preferred creditors, which basically means employees - the taxman used to be preferred, but not anymore.
Finally the unsecured creditors get to pick over the bones.
If Kimi is under a contract of employment then he gets the same payout proportionately as all other employees, but if he's on any other sort of contract (very possible), he might not be classified as an employee and therefore he'd receive the same as the unsecured creditors - probably nothing.
When Proton took the charge (Feb 2012) assets were valued at about £45M, and outstanding 3rd party loans at the end of 2012 were £40M. Obviously things will have changed since then, but on that basis it looks like Proton would get their money back and everyone else would be screwed.