Remember, though...that while crooked as hell...what Enron was doing was perfectly acceptable under the law (for the most part). What you would have to prosecute on would be the "reasonable assumption of risk" language that surrounds the reporting of investment income.
Yes and no. The selling of resources to other pseudo-companies appears to be fairly legal, however the transfer of debt to other companies (that were basically extensions of Enron itself) and then not reporting same said debt (of held companies) seemed to questionable to a number of accountants/legal experts, iirc.