Honestly I can see why people always debate these things. East vs. west, niche vs popular, irrelevant vs current, etc. It's because in truth all these character choices just come down to whatever Sakurai's puckish whims tell him to add, and we all desperately wish there was a more recognizable pattern and control to it.
I lament a lot of Sakurai's choices, but honestly who among us can't sympathize? If I was in charge of Smash I can't say I wouldn't do the same thing. Just pick who I like, pick who I think would be cool, throw a bone every now and again to the fanboys of series I'm not particularly interested in. But sadly I'm not and people don't get to see my genius vision for Smash on display. Oh well~