I just think that the things Vincent needs to work on are within his capabilities going forward.
Perhaps, but I think you're are underestimating how much of an issue it's has been compared to Jason's quad/3A troubles. Vincent has had URs for his quads dating back all the way to when he returned to skating as a junior man post-injury in the 2015-2016.
He's had competitions where there was a favorable tech panel and he managed to get away with fewer underrotations, but in general, the under rotations are not a new problem and Vincent has been working on it for several seasons, just as Jason has struggled with the quad for several seasons.
I just added the four continents data and here's how they breakdown ATM.
season's best
Overall: Vincent (2-272.22); Jason (3-263.42)
SP overall: Vincent (1-100.18); Jason (2- 96.41)
SP TES: Vincent (1- 57.93); Jason (2- 50.69)
SP PCS: Jason (2 -45.75); Vincent (3-42.25)
FS overall: Jason (2-172.32); Vincent (3 -172.04)
FS TES: Vincent (2 -88.56); Jason (3 -82.46)
FS PCS: Jason (2 -89.86); Vincent (3-83.48)
Overall SB average: Jason (2.14) Vincent (2.14)
averages
Overall: Jason (2 -249.37); Vincent (3-232.05)
SP overall: Jason (2-88.77); Vincent (3-78.33)
SP TES: Jason (2 -44.31); Vincent (4-39.65)
SP PCS: Jason (1-44.52); Vincent (3-39.07)
FS overall: Jason (2- 160.60); Vincent (3-153.72)
FS TES: Vincent (2- 76.06); Jason (3-73.21)
FS PCS: Jason (2-87.39); Vincent (3 77.87)
Overall ranking average: Jason (2.00); Vincent (3.00)
The numbers don't lie. There isn't a clear #2. We can talk all day about *potentially* who could run away from it, but right now, as far as the numbers go there isn't a clear No. 2.
Now if you want to argue that Vincent has beat Jason at their head-to-heads this season and gives a case he is starting to pull away, then that's a valid argument, however, I don't think 4CC in the first season of a four-year Olympic cycle isn't always a great indicator of how Worlds will go or the overall trajectory of the next four years.
I mean at 2015 4CC, Joshua Farris won silver and Jason was 6th, but then Jason was 4th at Worlds and Josh was 11th. And sadly we all know what happened with Josh after that season.

And the only person from that world team who ended up in the Olympics was Adam, who finished 8th at Worlds that year.