Here's the explanation for everyone wondering why Raiden is the main character and Black Lightning is simply a skin:
1 - Name recognition. Raiden is far more well known among fighting game fans than Black Lightning. Raiden will sell more as DLC than Black Lightning would. This is just the bottom line.
2 - It's easier for NRS to import a character that already has an established moveset as opposed to creating Black Lightning as a dedicated character from scratch.
I realize people are salty about Raiden and Sub Zero being included in INJ2, but everyone needs to get over it if you plan on continuing to play NRS fighters. Guest characters will always be a thing because they sell really well.
Having said that, Raiden doesn't look all that interesting. In my opinion, Sub Zero is the most boring character in the entire game. Hopefully Raiden will be a bit more different from his MKX iteration than Sub Zero was.
Either way....I got Manta and Hellboy in this pack, so I'm not going to complain.