1. Totaly agree.
2. The reason is simple: Marth ,Roy and Lucas can join SSB4 because they are all Nintendo characters, even Mother3 is Japan exclusive. (Moreover, Japanese Mother fans might be not pleased if they don't see Lucas in the game, removing Lucas in non-Japan versions could make western gamers feel like they have to buy a incomplete game as well)
But when it comes to Klonoa, a SSB4 team member might say: "Klonoa Heroes was not released in the west, and Klonoa's not a Nintendo character, so putting him in SSB4 is surely a bad idea." I might be exaggerating, but limitation always exists.
Even a big person spoke for us, you still can't expect to see "that Klonoa you exactly expected" shows up, for the same reason - "Klonoa's not a Nintendo character".