WI: Charles the Bold has a surviving brother

Hi everyone, second post here.

During my research on the Burgundians/Habsburgs, I noted that Charles the Bold - father of Mary of Burgundy - had two slightly elder brothers who died shortly before Charles's birth in 1433. But let's say that Isabella of Portugal manages to have another son with Philip the Good - Jean (b. 1434-35). How would his existence affect Burgundian politics?

Let me know what you all think :)
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Put this in the miscellaneous thread.