Question about neck design and toe flow

I’m a little confused on the impact of neck design on toe flow and when comparing Newports and Phantoms. I prefer less offset (so the jet neck), but also minimum toe flow.

I currently game a Phantom 5.5 which kind of gets me the best of both worlds. When comparing the 5.5 to the new 5.2 they are both listed as “near minimum” toe flow. But when you go from a Newport 2+ to a 2.5+ you go from medium toe flow to near maximum.

Why does the jet vs plumbers neck increase the toe flow so much more on a Newport vs a Phantom? Does it just come down to how it interacts with the head design?