FlareHabanero
Banned via Warnings
It's safe to assume the concept of the tip sweetspot is based on the rapier.I was literally referring to what they had to work with in creating Marth.
His character is certainly fresh in the environment of Smash Bros. Not sure how they decided on the sweet-spot concept, but I like it.
Rapiers are long thin swords that can cut to some degree, but are designed more so for stabbing due to it's thin design. As you know, Lords having a rapier as their default weapon is a traditional attribute, with a few exceptions. While it's true that Marth's weapon the Falchion is more based on the claymore, it's safe to assume that the reason why Marth has the gimmick is a nod to a rapiers functions.
Though, it becomes more apparent when in Brawl Marth actually gets a move that stabs.