For the first, this was assuming walled stages are still banned. If they're not, well, they ARE counterpicks, so it's not like you're going to be surprised about your opponent's choice of character like you can be in the double-blind pick for the first round. Since pretty much every character has an infinite on walled stages, there's really no reason to ban any infinites if you're choosing a walled stage.i'm pretty sure that dedede is a VERY trendy counterpick on walled stages; you're going to have to have an official watching a lot of game2/3s
are your judges going to have stopwatches too to make sure 1 second has passed? are you going to be able to tell if ddd grabbed the guy during the 2nd frame of his jump?
As for the second, how the hell is the Dedede going to tell if the ref can't? For the 1 second thing, I suppose that's unnecessary. If you have enough time to visibly put your shield up, you have enough time to do any other action. Besides, it's not like the grabber doesn't have two perfectly good alternatives to an attempted regrab. Throw a different direction, or attack. Marth can fsmash, Yoshi can usmash, D3 can utilt, and, well, I'm sure Squirtle and Charizard have something, although they have KOing throws that would probably be better choices. All of these are completely unavoidable as far as I know.