Kumo Desu ga, Nani ka?

I'm all caught up in the story and I've read every chapter but I just can't understand why Shiro wants to gather people who have ruler skills? Is it supposed to aid with defeating the black dragon guy? 

What??? I'm dead lolm 

She'll kill them if they stand in her way, in the furthest part of the story there's already 1 classmate who was manipulated by her and indirectly killed. But she'll try to avoid killing them if possible because it'd make the teacher sad, she does seem to care about them to some degree so she's not completely apathetic towards them. 

I figured it would take a much smaller role in the story with all the side stories taking priority, I just wanted to check and see if she'd actually keep improving. Even if it's only mentioned in passing, I'd like to see her keep improving and maybe be a match for D one day. 

The egg later hatched into a dragon who was a reincarnator and one of the classmates back in Japan, the egg was given to a prince who was also a classmate and reincarnator and later became her disciple (i guess? I don't really remember, i quitted after chapter 300 or so) 

Just started. I'm not very far in. Can someone tell me whatever happened to her(stolen, not really hers) giant egg? 

she does 

In the egg there was a dragon that is her reincarnated classmate who bullied her, the egg was given to the 4th prince of some kind of country which name I don't remember(also he also is a reincarnated person)where she hacked and lived with the price as his pet as what did they do later which form she evolved you can look up on wiki