Re: Justifying Playable SPD
To start with, NCM does not exist in a superheroic campaign except as an optional Disadvantage. This is RAW; local campaigns can (and do) vary.
Second, in the CU, SPD 2-3 is Skilled, SPD 4-5 is Competent, SPD 6-7 is Legendary, and SPD 8+ is Superhuman. (CU, p. 28) Obviously, a super could have SPD in the Competent range, but a non-super could have SPD in the Legendary range, so there is some overlap. Again, local campaigns can (and do) vary, but this is the official standard for the CU.