While the OP compares lots of mainline games against spin offs, there is some hidden truth, for example:
Demon's Souls (1.68) did not see such an increase across 3 platforms with Dark Souls (2.14) especially considering it was 3 times the production of the first one.
And of course Final Fantasy XIII. a big wtf to some xbox bigmouths. especially considering it was more of an action game than any mainline FF game.