Hmm not sure yet on that. Shuri def is a engineering genius (which she isn't in the comics mostly), but in the comics it seemed like T'Challa was more into bigger theoretical issues, not necesarily creating devices and stuff all the time.
I do wish they kept T'Challa as master fighter though, comic T'Challa knows like fiftysixty something fighting styles.
I'm surprised no one has brought up W'kabi as a potential villain. I know he's probably locked up now, but he would be a interesting pick. But I imagine with phase 4, all the films going forward are going to be team-ups like Thor Ragnarok, where you have multiple avengers together.
Well in the comics T'Challa was anywhere from top 5 to top 8 smartest in the world, Shuri wasn't in that conversation altho she was always very capable.
In the MCU however, the black panther producer said Shuri is in fact the smartest person in the MCU, and smarter than Tony Stark.