[link|http://www.brook.edu/comm/policybriefs/pb97.htm|url]
The immediate accounting problem exposed by Enron's failure was the weak consolidation rule prescribed for highly leveraged "special purpose entities" (SPEs), or partnerships that were formed to carry out various projects whose assets and liabilities were not shown in Enron's balance sheet. Enron failed in part because of losses arising out of the many SPEs that it had created.
The rule for some time has been that sponsors of an SPE need not consolidate it so long as outside investors contribute a majority of its capital and that investment constitutes at least 3 percent of the SPE's assets. Leaving aside the fact that Enron appears to have misled its auditor, Andersen, about the amount of outside investments in SPEs (thus wrongfully avoiding consolidation), it is now clear that the 3 percent test was much too weak. FASB has since rightly raised the threshold to 10 percent.
Guess you're right in that there was a little bit of both going on.
Still...there should be a full disclosure requirement, regardless of investement. The companies liability needs to be recognized and reported.