Sorry, guess I should've said that if Vincent is scored fairly he would receive 5s and 6s in PCS. He has a lot of promise, but his presentation and skating is nowhere near as developed as Nathan's was last year.
Euros (and Bavarian Open, for that matter) is a much weaker field than Worlds, and Samarin had success on JGP and JGPF to begin building a rep that Vincent doesn't have.
If a skater's only performances of the season until Nationals are poor showings at the junior level, throwing them to the judges at senior Worlds could wind up being a huge mistake. Bavarian Open hadn't happened yet when USFS announced the team,

. The rules for team selection did not include any competitions after Nationals, so the decision USFS made was and is reasonable.
Both Vincent and Jason made a lot of mistakes at Bavarian Open and 4CCs and wound up with very, very close scores, but it's reasonable to assume that Vincent would receive lower PCS at Worlds, where his weaknesses will be thrown into obvious relief, skating alongside men like Patrick, Yuzu, and yes, Jason.