Okay so what I'm implying is:
Nexus: A singular Nexus Fragment allowed a Human to become one with Everything in the Creator's Dream, which should include Eternity, as WoG, Oblivion, and Ka'dmon heavily indicate he's in the Creator's Dream. The Fragments are High 1-A, but due to how much they amps, a Nexus Fragment merging with another back into the Nexus would apply the Human--> High 1-A leap to an High 1-A Fragment, and since the gap between High 1-A & 0 is akin to High 1-A & 1-A, it would result in 0.
Keep in mind that even if you disagree with them, the amp Man-Thing gets by merging with The Nexus would still grant him that tier, which would affect these Titans in DeMatteis Storyline Amped Man-Thing (3rd strongest), Amped Scrier (2nd Strongest) , and Daydreamers Franklin (1st : He's unironically ridiculous)
The Divine Creator: 0 (He's the Creator of the Dream and Nexus. He's literally stated to be The One Above All and his equivalent, so narration implies he's at least supposed to be comparable. If one variant is stronger I'll leave that up to others to decide)
Ka'dmon: 0 (He's stated to be a threat to The Divine Creator. Even if the idea he doesnt scale fully, the one who made the statement is aware of The Divine Creator's being the creator of the Nexus since they were there to hear it, so it'd at least mean he's in this league even if he isn’t an outright somewhat comparable being)
Man-Thing / Ted Salis: 0 via various haxes, amps, and with his job as The Men of Lineage
Fallen Stars: 0 (The Divine Creator's Emotions given Manifest. The Fallen Stars are described as capable of warping the Nexus, which requires significantly affecting it. Above Amped Strange who holds off the collapse of the entire Cosmology)
Power of Love Spidey: 0 (Holds back tbe Nexus. Defeats the Amped Walrider who curbstomps the Nexus Guardian who could handle the Nexus' powers by herself)
Job Burke: 0 (Above Ka'dmon)
Daydreamers Franklin: Unironically 0 (He unironically has the best feats and scaling to this through Man-Thing by how insanely casual he scales to the most Amped Man-Thing. While he is very important to DeMatteis stories and the events of Heroes Reborn plays a critical role in almost every major DeMatteis comic at the time, he only has 1 appearance so it's likely he wouldn't get a key)