Green Mamba
Member
You don't need a source, you can compare the designs directly:I'll need a source for this. In the Developer Direct he states Samus design so far has been based on Super Metroid (2:09 in the Developer Direct).
Brawl:

Zero Mission:

The Zero Mission design is essentially the Super Metroid design with some of the extra lights from the Metroid Prime design added onto it. So for him to say that the design in Brawl is based on Super Metroid isn't necessarily completely wrong. But in this case, I believe Sakurai misspoke, because the design in Brawl is absolutely based on the Zero Mission design, much like Zero Suit Samus and the Norfair stage were.