I have read the same thing. What is missing are the actual accounts of the replacement .45 's successes against the Moros. The story dead ends at that point.

I suspect that the issuance of the .45 was deemed the solution and that there was no point in complaining about any continuing inadequacies of handguns vs. Moros. The .45 inch bullet was the largest that could be incorporated into a practical revolver design. The troops got their .45 and could no longer complain about caliber no matter what the actual result.