Why is Killmonger's "ancestral plane" vision different?

Question

In Black Panther, in order to be King you must consume a plant which in the comics is referred to as the Heart Shaped Herb and then "enter the ancestral plane and reconnect with the past Black Panthers."

When T'Challa consumes the plant

He meets up with his father and other past black panthers and this is not just once it happens twice once when he originally becomes King and after when he is revived in the mountains.

However when Killmonger consumes the plant

He sees his father [who is not a Black Panther] and talks to him.

Why doesn't Killmonger see previous Black Panthers if that is the point of the vision ceremony?

Answer 1

As far as I feel, the literal sense is made for the ancestral plane, as his father wasn't a Black Panther (although he was of royal blood), so Killmonger not seeing previous black panthers but his father makes sense.

As far as movie's explanation about ritual goes, they meet their ancestors (usually father), or whoever they have deep emotional anguish or love for. It isn't explicitly stated that the ritual ceremony needs to contain a vision of the previous black panthers.

Answer 2

Killmonger was NEVER the legitimate king as he did not fulfill the terms of the trial, death or yield.

Since he wasn't the legitimate king, his access to the knowledge of the lineage of Black Panthers was denied.

Further, it could be inferred that Bast denied him access to the full Wakandan ancestral plane since his motives and tactics for claiming the throne were in conflict with the still-living legitimate king.

Answer 3

Killmonger's Ancestral Plane vision is different because each person perceives the "planes of untethered consciousness" differently.

The Ancestral Plane is expounded upon in Moon Knight S01E05 "Asylum", where it was mentioned by the Egyptian goddess and Ennead*, Taweret, that there are "many intersectional planes of untethered consciousness" and that the Ancestral Plane is one of them.

^{* Note: Black Panther's Bast is also an Egyptian goddess and an Ennead.}
Dialogue from Moon Knight S01E05 "Asylum" (emphasis mine):

Taweret: You'd be surprised how many intersectional planes of untethered consciousness exist.
Taweret: (GASPS) Like the Ancestral Plane. Oh! Just gorgeous. Anyway.

The background to the scene where the above dialogue took place was that Marc Spector (Moon Knight) and Steven Grant (Marc Spector's alter-ego) were in a realm called the Duat. In Moon Knight, the "planes of untethered consciousness" are called the Duat, and in Black Panther, the Ancestral Plane.

Taweret: Because the Duat's true nature is impossible for the human mind to comprehend, you may perceive this realm as something more easily recognizable to you.

Killmonger's Ancestral Plane vision is different because each person perceives the "planes of untethered consciousness" differently. Unlike T'Challa, Killmonger didn't grow up in Wakanda, so he isn't as familiar with Wakandan traditions and views as someone like T'Challa, who grew up in Wakanda and was groomed to be the next king and Black Panther.

Killmonger's vision of the Ancestral Plane is something more recognizable to him, based on his past, in the apartment he grew up in and with his father, and not including his other ancestors or past Black Panthers who he won't be as familiar with.