Whoa...Rather detailed, aren't we? Lol. I'm not certain it's that big of a deal, really... There were a lot of things in the game that were kind of left as a loose end. I'm not sure if you noticed, but some doors were 'locked' and some paths were 'blocked'. Most games are mean like that.
I don't really think it's essential. It's a broken table. It looks cool. I'm pretty sure we'll never get much more, when you think about how much detail the whole KH storyline has. I mean, the mansion is full of stuff that's not explained.
Of course, I could be wrong. I'm just saying that we won't know until later, regardless of who - or what - did it.