Heidegger's Vom Wesen des Grundes

In 1949 Heidegger had the opportunity to a add a preface to the 3rd edition of his Vom Wesen des Grundes.  He took the occasion to close an additional preface as follows:

Wie wäre es, wenn die Besinnlichen begännen, auf diese seit zwei Jahrzehnten wartenede selbe Sache endlich denkend einzugehen?

When you hear that Heidegger was unapologetic, it can help to remember that twenty years earlier he had celebrated a Fest for Husserl in the company of Edith Stein with whom he had worked on the Husserl texts for inner time consciousness.  Stein had since perished in the Holocaust.
Let us turn to the ending of the book:

dem Dasein als Selbst das Erwachen der Antwort des Mitseins, im Mitsein mit dem es die Ichheit darangeben kann, um sich als eigenliches Selbst zu gewinnen.

It is difficult to read such a closing passage knowing that the Master had a chance to add a thoughtful rewording with less of Self and individual.  Consider this: his one case of collaboration also dates back to 1928 (the year he says gave us his Kant book and this book on "grounds" or "reasons") and in his editor's introduction to that book he suggests that Edith Stein had worked on it as a steno who had added the chapter and paragraph divisions to a "transcription".

Nothing in the closing of the Grounds book evokes You or We.  This is the author who ridiculed Schelling as being a mere "thinker" and not a "philosopher" - this is Heidegger who took the concept of "horizon" and "Eigenwelt" and reached his greatest depths of profundity in evoking the "world" and "transcendence".

So in some matters he was a thoughtless fool and ingrate.  But he also seems to suggest that this book has been denied its readers those past twenty years - and that it is what they have been waiting for (Heidegger is at the time not banned from publishing but banned from teaching.)  What grounds might we have for distrusting the insight of the Master?

One reassuring possibility for his concerned, thoughtful reader is that the mere Schrift of an Edith Stein on empathy and others could not be expected to have interested Heidegger - or yet another possibility is that he also repeatedly neglected to actually read the work of his former lover and later confidante, Hannah Arendt.

But there is a philosopher with whom he will not now be able to communicate, an author who converted to the Catholicism of his youth, with whom he worked closely, the trusted secretary of his own former Master - Edith Stein.

To turn Heidegger on himself: we need not ask for the "reason" that he makes no mention, exposes no regret, but we can be open to someone evoking the "ground" for this neglect.