Does a complete ghusl require re-washing the parts of wudu' during ghusl, or is wudu' a part of ghusl and does not necessitate re-washing what has already been washed?

The complete ritual bath (ghusl) is valid even if one does not re-wash the ablution (wudu') parts. A complete ghusl involves making the intention (niyyah), then saying "Bismillah" (in the name of Allah), then washing the hands three times, then washing away any impurities. Then, one strikes their hands on the ground or a wall two or three times, then performs a complete wudu'. Then, one pours water over their head three times, making sure to wet the roots of the hair each time. Then, one pours water over the rest of their body three times, starting with the right side then the left, and rubs their body with their hand. They should check the roots of their hair, the cartilages of their ears, under their throat, their armpits, the depth of their navel, their groins, between their buttocks, and the folds of their knees. Assuming that the water has reached all parts (isbagh) is sufficient. Then, one moves from their spot and washes their feet. The apparent meaning of this narration indicates that one washes the remaining part of the body, not all of it. This shows that the person performing ghusl does not need to re-wash the parts of ablution because they have already washed them during their wudu'. In summary, the matter is easy. If a person pours water over themselves, it is most likely to reach all parts of the body, and thus it is considered that they have washed their entire skin.