What is the most important rule? That we should do whatever the hell we want, but preferably in the best interests of Games workshop when possible? :P Ill go with that
yep going to ground on an objective is I believe one of the tactics encouraged with Plague Bearers in the Daemon army, as they get a save and FnP roll for almost all shots at them, making them difficult to dislodge.
I've not read any rule saying a unit that goes to ground/is pinned doesn't count as scoring. If someone could quote the page where it says that, then it would resolve the issue, otherwise, that which is not forbidden is permitted: without a rule that explicitly states "Units which have gone to ground/are pinned cannot claim objectives", then units that have gone to ground/are pinned can obviously still claim objectives.
I always thought it was the best way to actually claim an objective, especially if you're a unit with Stealth. It's why I use Space Marine scouts to hold objectives when I play Marines. When needed, 2+ cover saves are hilarious.
Thanks for the input. I re-looked over the 40K rule book and the areas that might come into play, and going to ground seems like a really great and legal tactic for holding on to an objective in the final few rounds.
Your Codex is only great until the next one is released.....