Because he is a living person and only the dead must stay in the Underworld. Also, he does not go into the Underworld, but speaks to it's ghosts.
Elpenor; comrade of Odysseus. Teiresias; who Odysseus sought in Hades. Antikleia; the mother of Odysseus.
Ajax would still not speak to Odysseus in Hades, as he was still angry at Odysseus over the battle for Achilles' armour.
Tiresias.
he goes into hades or the underworld.
Odysseus gets to Hades by traveling in the lake of fire and sacrificing a goat.
In the Odyssey, he did not go into the Underworld but merely summoned ghosts of the dead to speak to him.
Elpenor; comrade of Odysseus. Teiresias; who Odysseus sought in Hades. Antikleia; the mother of Odysseus.
Odysseus does not venture into Hades, he merely speaks to the ghosts of the dead by a ritual.
Ajax would still not speak to Odysseus in Hades, as he was still angry at Odysseus over the battle for Achilles' armour.
These gods never met Odysseus.
hades
nothing
Tiresias.
he goes into hades or the underworld.
Odysseus gets to Hades by traveling in the lake of fire and sacrificing a goat.
Odysseus meets Elepenor, a comrade of his, and Antikleia, his mother.
They did not meet. In the version I read Hades is not even mentioned. Only his domain.