So why ignore it then? This makes it almost certain that the number of copies of Shadow Fall actually sold, combining bundles and standalone, is higher than the number quoted which is standalone only.
KZ3 was released in 2011, years after the PS3 launch, and the PS3 install base was millions and millions more than that of the PS4 currently. Therefore, millions more potential customers for KZ3 than there were/are currently for Shadow Fall. You can't just say "install base isn't a valid argument" without a reason, because it clearly is valid - if more people own a console, a game's potential userbase will be higher than that of a game on a console owned by less people, and therefore numbers are usually expected to be higher for the game with a higher potential userbase - i.e. KZ3.
Basically, your argument makes no sense.
Those facts don't change the game's budget and profitability targets. If Sony's willing to absorb the loss by releasing the game on smaller user base, that doesn't change the fact the series' negative continues and that Killzone isn't a self-sustainable franchise for them.
You just moved the goalposts so far I can't see them any more. Your argument was Killzone SF is "following a trend" because it sold less than KZ3 sold to a vastly larger userbase (and that not even counting bundles, which may well amount to it selling more). Now your argument is completely different, so what's your point.