The mention of repeating wudu in these two narrations is based on a recommendation (istihbab), because, as previously established, ghusl for janabah suffices for wudu. If no new action that invalidates wudu occurs, there is no obligation to renew purification unless there is definitive evidence necessitating it, and no such evidence exists here. It is also possible that what came out after the ghusl was urine, in which case wudu would be obligatory but not ghusl, as indicated in the narration.
Commentary #35