In real life, the financial status of your competitors is usually fairly public knowledge: companies are required to release annual financial statements. Yet in AE, apart from the valuation ranking, there is very little ability to analyze such information. This is true even for airlines which engage in leasing - where, at least theoretically, the lessor takes on the risk associated with periodic payments.
Why not have a required financial disclosure for any airlines who want to lease planes. Information could include DOP, salary expense, etc. Airlines could still choose not to release the information, but would then be confined to buying aircraft only.