1.)Because gravity effects everyone, except sasquatch
2.)Buying shoes
3.)Because it only existed in the future, you know how things in the future can have a past. It makes perfect sense if you refuse to think about it.
4.)Funny story on that, they actually went to buy shoes right after Revan and Malak left the store on Hoth. Then their was a big snow storm and they had to stay there for awhile. That ofcourse is before Sion decided to go shirtless the whole time
5.)Well you see, when the gravity well, or I mean when you think, ....huh, I guess what happen was there must have been a sith lord with the ability to time travel, like that show Quantum Leap