
H19279:
@AH
Gao Xing being subsumed by Xuan Yuan was likely going to happen sooner or later even if CX wasn't on the throne. It just happened faster with CX on the throne because the Grand Emperor was willing to cut the war short and to hand the throne over to CX, whom he had personally taught with the intention of making CX his heir.
White emperor planned to pass the throne to CX. However it would have happened in thousand(s) of years.
His father had ruled the country for thousands of years. He paid high price to get the throne. He just ruled Haoling for -400 years.
Haoling was not weak. if it was not CX as Xiyan’s ruler, Haoling could have fought against Xiyan in a different way. Old Yellow emperor would not attack Haoling and CX’s uncles were inferior in comparison with Shao Hao.
Agreed, Shao Hao was still healthy and mentally + physically strong at the time that XL accepted the bug transfer. A power change in Gao Xing wouldn't have seemed like it was likely to happen in the near future.

H19279:
Shaohao’s mental health deteriorated after he brought XY to the desert to meet Ah Heng.
Yes, agreed. His mental health (and physical health, iirc) deteriorated significantly after chapter 36, and only recovered after he passed the throne to CX (in chapter 41), left Five Gods Mountains, and took up blacksmithing again.

H19279:
Therefore, CX as ruler of Xiyan and XY’s return played crucial role to accelerate the merging of Haoling to Xiyan.
Yes, agreed. At the time that XL accepted the bug transfer, it would have been pretty much impossible to predict that Gao Xing would end up becoming part of Xuan Yuan as soon as it did.

H19279:
As for evidence/proof of political landscape or characters’ opinion about the war and its outcome when XL accepted the bug, I think the information/excerpt in chapters after CX became king (actually after WXL ebecame Wang Ji) is irrelevant. XY’s returned and helped CX in his quest for power changed history
Where that information and the scenes in those excerpts clearly echo things that are shown in the chapters before XL accepted the bug transfer (and IMO there are many instances where they do), I think they are relevant.
Where they reflect circumstances that had changed unexpectedly after XL accepted the bug transfer (e.g., changes due to CX becoming Emperor so soon or due to the Grand Emperor visiting Ah Heng with XY), I agree that they are not relevant for providing insight into XL's expectations and plans at the time that he accepted the bug transfer.