the Space Pirates were drained because, my guess would be that Mother Brain caused the Metroid outbreak as a last resort to stop you. She's safe in her Command Center, so they can only go after you and the ill fated Pirates.
Yeah the Ruins Test suit was a gift from the Chozo. You were fated to come back to that room someday. Old Bird took you to see it for a reason. The Chozo crafted the newer model you were previously using, but it went kaput because the Suit was tied to your custom built ship. The gifted Power Suit is a more ancient model. So the one you're most familiar with. This is the one. It still goes back to the same style of Power Suit you had when you don't have the Varia. As you saw in Super Metroid. (if you were to use the Debug Code that toggles the Item Switch option. It still uses the Varia Suit model when without Varia/Gravity in this game.) The reason you can use all these Chozo made suit abilities is because they donated their genetic material to you. Plus your suit is so modular that it can work with any other kind of tech as well.
@@Psycaroo there's a manga that serves a prequel story to this game. And it also features many of the battles leading up to Mother Brain but in their own way. It serves to show you how Samus lived before taking on this mission.
Samus's Zero Suit is a failsafe tailor made by the Chozo. That can store any and all upgrades collected for future use. It also augments her natural physical abilities even when unable to use the abilities of the Power Suit. The only problem is the only time Samus can use the Zero Suit is if she turns it off herself. If energy shielding of the Power Suit is depleted by enemies environments or weapons fire, the suit literally explodes and kills her body. In some cases though the suit doesn't explode but she is exposed and unable to block the rest of whatever is hurting her and it kills her.
