It sure did. You did awful lot of digging!
1. You have to go by what Samsung white paper says, not what FT says. That is 28A top voltage is 4.3v, not 4.2v (3.7v). Since people may be avoiding 4.3v, FT may be pushing 4.3v as 4.2v.
According to the HKJ’s review of Samsung ICR18650-28A 2800mAh (Purple):
only charging to 4.2v the battery loses about 220mAh in capacity. The capacity of pulled cell is 2580mAh, not 2800mAh.
2. As for the SFL, I defer that until you figure it out.
3. Speaking about the color ‘purple’, on my screen, the purple is not purple but a blue with tiny hint of purple. For example, at the FT, the 28A ‘blue’ looks exactly like 28A ‘purple’.
4. As mentioned in (1), I don’t think FT is pushing counterfeit, but merely pushing 4.3 as 4.2 to make it more appealing.
Thanks for the wealth of information you researched.