The determination of what is or is not material info does not depend on the self-serving present day statements of an actual investor as to what they might or would have done in the past had they known that info.
The determination is an objective one, and the judge will make that on her own. If she had wanted, she could have asked for expert testimony on the issue. So it does not matter that some shareholder or debt holder - after the fact - did or did not testify or submit evidence as to what they might or would have done.
Nor does it really matter, except possibly in a subsequent criminal IT case, whether the SNH's thought the info was material or not, even if they relied on the advice of counsel. If that mattered then IT cases would be very rare because everyone could say "Well, I did not think that info was material..."
If, in the judge's view, a reasonably prudent investor would have taken the concerned info about settlement negotiations into consideration when making an investment decision (whether to buy, sell or hold), then it is material.
And, IMPO, I cannot see how the judge could possibly rule that the non-public info that was in the possession of the SNH's about on-going settlement negotiations was not material.
My issue is this: even if - as I believe will happen - the judge rules against the SNH's on the IT allegations, what are the consequences in a bankruptcy proceeding, in this bankruptcy proceeding? Is the GSA so tainted that it has to be tossed as well as the POR on which it was based? Or does the judge simply accept the deal, but sanction the SNH's, possibly by knocking them out of the waterfall. I don't know the answer.