Forum:Why only the seven Halo Rings?

As all people who have played Halo before, there are 7 rings made to annihilate all life in the galaxy. Now we get to the reason I created this thread, I have just finished reading Halo: Cryptum, I found mentions of there being 12 Halo's and then 5 being destroyed. In Halo 3 you find out that the Ark is suppose to rebuild broken or destroyed rings. But still there is only 7 Halo's left (6 if you count the destruction of Installation 4B). Why didn't the Ark rebuild the other 5 rings that were destroyed?
 * Because they were deemed too devastating and against the Mantle. The reason why they were at the Homeworld was to be decomissioned. The same was probably true about the Ark. When Didact and/or whoever intervened, they probably only set it to only reconstruct seven. It is also a possibility that the world in the center didn't have enough rsources to reconstruct five, and was reserved for emergencies only.


 * Keep in mind that it only took seven to get the job done. Besides, the less rings there are, the less chance of us, humans, stumbling onto it and activqating it without knowing any better. Missing Mandible 01:56, 13 July 2011 (EDT)

Aswell, It may be true that 5 got destroyed, but even so, yes the ark repairs them, but 7 is all thats nessesary, which uve already mentioned, but the ark is designed to only survice 8 at a time (one will rotate around each of the arks spar's), and it may have rebuilt atleast onother, but it is possible it did make another, but it got destroyed in time from an astroid impact or something similer, and the halo array just re-arranged itself to cover all territory (Dont forget, the halo's are very fragile, in a sense, theyre edges are 22.3km thick, a large astroid could cause enouph damage)--The Grave Mind 19:34, 18 July 2011 (EDT)