The meaning of these narrations is that when such ghusls, or any of them, are combined with the ghusl of janabah, wudu is not required. However, if these ghusls or any of them are performed separately from the ghusl of janabah, wudu is obligatory before them. This is supported by the earlier statement of the Imam عليه السلام: "Every ghusl requires wudu beforehand, except the ghusl of janabah." This explanation clarifies the matter further.
Commentary #31