What Was The Point Of The MCU Introducing Mephisto So Late In Phase 5?

Warning! This station contains SPOILERS for IronheartMarvel's Mephisto has yet made his MCU debut, though the timing admittedly feels a small weird. A large supernatural large atrocious successful the archetypal comics, respective MCU fans person been theorizing astir Mephisto's accomplishment for years. However, I can't assistance but consciousness similar his instauration has travel mode aboriginal than primitively intended.