The only real answer in this case is that no returns were filed. The fact that the account transcripts don't show anything also says that you're lucky right now because the IRS hasn't prepared substitutes for return for the years in question. That means that the trustee and the personal representative now have the ability to come in from the cold first and file the returns before the IRS comes looking for any unpaid taxes.
However, in addition to the six years for which you say transcripts were requested, I would suggest going further back to see if you can identify the last time a tax return was filed. The reason for that is just as a precaution; while the IRS generally limits its demand for returns from nonfilers to the last 6 years, under appropriate circumstances (e.g., suggestions of fraud or hanky-panky with a trust) the IRS may go back further.
Also, make sure you're getting copies of the two basic transcripts the IRS makes available: the "account transcript" and the "wage and income transcript" - the first shows all of the activity on the account starting with the filing of a return (if any) and any subsequent activity, such as examinations for unreported income, collection notices, and the like. The second shows all of the information that was reported by third parties to the IRS, such as K-1s, Forms 1099, W2s, and the like.
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It is not entirely clear to me whether you mean that the individual did not file a tax return or the trustee of the trust did not...or both. I can see where the trustee might have passed all of the income through to the beneficiary, and the trust would then reflect zero income.
The Personal Representative is going to need to work with an attorney on this to determine how best to correct the non-filings.
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No-I think your thinking is correct.
Now the PR and Trustee will have to file the back returns in order to finalize both estates.
The answer given does not imply that an attorney-client relationship has been established and your best course of action is to have legal representation in this matter.