I (still) think she's legit.
Look at the size changes of Hitomi Tanaka; in the past couple of years her tits have (also) nearly doubled in size.
When growth starts to happen, exponentially, things (can) change very rapidly.
Let's assume she doubled in size every 6 months; from 2012 to (end of) 2014; the volume of her tits would be 64 times larger
at the end of 2014 than at the beginning in 2012; small tits at the beginning in 2012 will still make gigantic tits at the end of 2014.
In Mythbusters terms "Still Plausible".
[Math: (in units of titvolume)
2012(beginning)= 1 unit ; 2012 1/2 = 2 units
2013(beginning)= 4 units; 2013 1/2 = 8 units
2014(beginning)= 16 units ; 2014 1/2 = 32 units
2014 (end of) = 2015 (beginning) = 64 units ]
As Adam Savage would say: "Thâârr's ye'rr problem"
Kind Regards,
DollyNood