How much it affect the chainscaling? I assume they will all remain Low 1-C as they should at least scale to peak GoW 2018 Kratos.
However its seen like only the strongest Titans and Olympians like Ares, Hades, Poseidon, Helios, Artemis, Cronos and Atlas will be comparable to the Primordials like Uranus, Gaia, Sisters of Fate and Thanatos. And i guess the strongest of Demigods or begins on similar level should get the same treatment like Hercules. Which in turn would put them at similar level to the strongest begins in the Norse Realms like Baldur, Hrólf Kraki, Sigrún, Thor, Odin, Týr, Heimdall, Freyr, Faya/Laufey and Freya.
Basically the only one who should upscale above all of them are peak GoW3 Kratos (with or without Power of Hope), Zeus and likely GoW Valhalla Kratos.