I have experience of selling companies so suggest the following might be the scenario.
Why would any other carrier want to buy 'it', what is 'it'. A handful of leased aircraft operating on marginal routes, different of course if the aircraft are on the balance sheet. No doubt the costs of operating ex PLH will be absorbed by the parent companies balance sheet to enhance the airline for sale so where is the value is the question. An outside investor or someone who wants to get into the business quickly is most likely otherwise suggest ebay.
Potentially bad news for Plymouth Airport I would have thought since Sutton Harbour probably only started ASW to keep the airport alive in the first place.