Oh no, double post. I have some info.
So far, for what I've been testing on a Level 9 Wolf on FD, you can chain grab uthrow at 0% until what 80+, which at that point you can just dthrow>Fsmash. I have no clue if a real player can really get out of it.
EDIT: Well I saw the Wolf jump out of it, so I guess this is possibly scrapped.
These are all against Lvl9 CPUs, not real players
You can dthrow chain Lucas from 0 to about 50%+
Since Roy and DK are the same fall speed, even though DK is a bigger body, you can dthrow chain grab the same %s.
If you get the timing right, you can dthrow chain DDD till possibly 80%+
Sadly, this is as far as it goes. Marth is the next for fall speeds and you cant really get a regrab.