Man, I need to read up WeRock Rules and classes before I can give serious input as to that part of the question,
but I think the one thing that Big needs to keep in mind, where Delta is more a competitors event than a spectator event and an introduction to competing for many. I would like to see in the stock class/JK class (if they run it) courses that test driving skill and strategy but don't necessarily risk trashing/rolling a rig just to compete for two days.
WeRock likes to put on a "show" for spectators to justify them spending the money to attend, but the show is usually at the expense of competitors. Luckily to be a comp driver you are committed to the game and hopefully have some sponsors to help cover repair/rebuild costs. Stock and JK guys generally aren't in that world and will likely stay away.
I have a couple of friends that are interesting in running a JK class, but I can't see them willing to trash their rigs on "extreeeemmmeeee" courses for bragging rights and gas money.
Granted I didn't compete last year so it might have been different, but the first year Big helped with DCRC the stock courses raised some cain with a bunch of the drivers in terms of breakage and body damage. Think of the black YJ from Idaho that broke everything and had to be lifted back to their camp. (Granted it is hard to tell the fine lines between "too easy", "just right", and can you roll my rig back over...)
Hope that doesn't sound like too much of downer...
The other concern that might already be answered in the rules, that I haven't read yet, is safety equipment. Stock and JK should allow OEM safety restraints with helmet, if they want new folks to try things out, keep the barriers to entry to a minimum. (no harnesses required for those classes)