So, basically Lychon, you're trying to deny the equally valid, and arguably more used definition of parsimony in a game of one up manship and nitpicking. The definition quoted was ALSO from the fourth edition.

Parsimony is parsimony. If something is most parsimonious- in the sense of the second definition- it is the most frugal in regards to additional terms. As a solution between the two extremes, my proposed sequence was extremely parsimonious considering given evidence.

Insufficient is not synonymous with the scientific usage of parsimony, and it is not an acceptable substitute.