My opinion on Jameson getting a POV is that it makes me question the purpose of the spin off. From a critical perspective, Jameson's story was already told. He had four books dedicated to his character, I know his development wasn't the best but his arc reached its conclusion, meanwhile some of the new characters haven't even received the same level of attention yet.
The harsh truth is that stories should move forward. A spin off exists to expand a universe through new perspectives, not to keep circling back to characters whose journeys have already been completed. When an author continues giving protagonist level attention to an old lead, it can sometimes suggest a lack of confidence in the newer cast.
What stands out to me is the imbalance, if Lyra, Gigi and Rohan were marketed as the center of the series, then they should be receiving THE majority of the narrative investment, a POV is one of the strongest signals of importance in a story. Giving one to Jameson inevitably shifts attention away from characters who are still trying to establish themselves.
From a criticism standpoint, it also risks making the spin off feel dependent on the original trilogy, a strong spin off should be able to stand on its own merits. If readers constantly need to return to the original protagonists for emotional investment, then the new characters isn't being allowed to fully take ownership of the story.
The critical question isn't "is Jameson interesting?" Of course he is, he was the lead of an entire trilogy. The question is whether revisiting his perspective adds something essential or whether it's simply easier than fully committing to the characters this series was originally supposed to be about.
And I know some of you will say "but Grayson is also an OG character and a main character from the original trilogy'', the difference is that Grayson was OPENLY promoted as one of the main characters of the spin off from THE BEGINNING. Whether I enjoyed his POV or not is irrelevant, his narrative importance was established before the books were released. It wasn't a surprise because the marketing and the story itself positioned him as a major player.
Jameson, on the other hand, wasn't presented that way, that's why his POV feels different. The issue isn't that an original character got a POV, the issue is that a character whose arc was already completed is seemingly being elevated into a larger narrative role in a series that was advertised as focusing on other characters. Those are two very different situations.
And honestly, part of the problem is that some readers don't seem to distinguish between liking a character and analyzing a story. They see their favorite character get more page time and immediately treat it as a good writing decision but critical reading requires asking whether a choice benefits the narrative as a whole, not just whether it gives fans more content of a character they already love. Popularity can explain a decision but it doesn't automatically justify it. If readers only evaluate stories through the lens of their favorite characters, then they're not really engaging with the structure, themes, or purpose of the story, they're engaging with fandom.