Item Rating(potential) and Enhancement(star) System

Back on topic,

Nexon said: "Normal items have their usual attributes but Rare or better items will randomly be given one to three hidden potential attributes."
I've always read 2 or 3 attributes. Did we get owned?

Now that we have the client data, can those 3 points be checked in our files?
- The number of attributes cannot be changed by the cube. If the first glass revealed 2 attributes, you're stuck with 2 attributes forever.
- Miracle cubes can only upgrade or keep the rank of each attribute when used on the same item repetitively. The item will never lose rank.
- Each attribute is independent of the others when it comes to rank. You can have +9%/6%/3% (unique/epic/rare) on the same lvl 80 item at the same time.

To add onto the 3rd question, this is one thing I don't exactly get

From my understanding, say you have a 71-120 glove. That means the % bonus possible (Ignore other stats to make it simpler) is 3/6/9 and getting those is random.

But there's also the blue yellow and purple border which determines item rank. Is this 2 different things, or is like one the result of the other

i.e. 71+ items will all have the unique yellow border as a consequence

So my main question is basically asking about the color border rank + the rank bonuses depending on the level of the item