To be honest a lot of the Filipino and American soldiers under Fertig would be fine with him hogging the glory.In other words, Fertig would have unintentionally and likely against his wishes (Since by all reports he was someone that cared deeply about the Filipino people and have a great deal of respect for them), do the same thing to the Filipino allies under his command what in OTL MacArthur did to him: By hogging all of the media attention and stealing all of the glory, despite the latter being the ones who were on the ground, and did the majority of the fighting and sacrifice.
Considering that in events were he won aka did not die and did succeed in driving out the Japanese:
- Said Filipinos are outside the Japanese Bootheel (Even failing the reconstruction just means that they don't join the OFN and just become an observer). Not included in the game but it is also after the collapse of the Japanese Economy meaning that the Philippines may be economically on the rise given open trade with the USA.
- A majority of the collaborators were big land owners meaning that with them marginalized/out of the picture then there would be massive land reform (A big issue in Philippine politics before and after the war).
- The fact that it is either the Southern part of the Philippines or a collaboration government with the communists means that "Imperial" Manila won't be likely to have such a dominance over Philippine politics means that the political scene would be less dominated by borderline feudal rulers.
- The Americans can either go home to the USA or settle peacefully after fighting for what seemed to be a hopeless forever war.
- The Filipinos genuinely liked Fertig mostly because in many cases he was assisting the local governments against Japan and promoting individuals based on merit. Not to mention that his ragtag group of engineers were legitimately that vital against Japan as in the spine of Philippine resistance in the South.
They would not be angry that he gains the glory because as far as they are concerned he actually earned said glory.