Questions the campaign left me still wondering

[Xindaris]

Since the "default campaign" generally acts as part-tutorial, I understand most of what seems to be important in CW4. However, I was left with a few questions, and I don't think the wiki is yet up to snuff for answering them. So here goes:

-What use/purpose does "ECO" terrain have? Is it just decorative, or what?
-Do the 3x3 or 5x5 panels actually do anything? I know you can connect them to your network, but there's no description anywhere of if/what they do.
-Did the obelisks/obelisk reactors actually do anything? I nullified them anyway, but I didn't really notice any difference between before and after doing so.
-How exactly do delegates decide what is or isn't "reclaimed" land? Is it just "has creeper, then doesn't"? I noticed that you don't gain any delegate percentage from holding land that doesn't start with creeper on it.

[BilboGCL]

Hi
Eco: If you plant towers in the forrest, you get an energy bonus (look at the small green number in the upper left)
Panels: Give you a bit of energy, best to be connected early on as a starter boost
Obelisks: IIRC they destroy a random nearby unit, but it is very likely I mix something up, so take this with a gran of salt
Delegate: Yes, it looks after "Has had creeper, is cleared now"

HTH and greetings from The Shire!

[Xindaris]

Thank you! That info should be fairly helpful to me in building maps too, I think.