what are u talking about?
sony ps4 sold through numbers are down 50k units in the us (tracked by npd)
sony ps4 sold through numbers are down 100k+ units in japan (tracked by media create and famitsu)
sony ps4 sell in numbers are down 600k units
nothing! indicates, that sony is up in sold trough the first quarter of 2015 globally
That is why you don't use Globally in US or Globally in Japan data to make WW maths.
2014: 1.8m in 64 days
2015: 1.7m in 56 days
Unless you believe PS4 didn't sell 100k in 8 days then PS4 is UP yoy using the lastest sold thought data.
We can wait the next sold tought data.
PS. The sell in numbers are cleary saying they used invenctory shipped in Q3 FY14... that is why they did shipped less than last year... they sold 1.7 million in Jan + Feb... so they really sold more than 2.4m shipped this quarter (my personal estimates put sold thought for Q4 FY14 at ~2.8m).