apples and oranges.
you two are debating entirely different things.
1/ whether the long side of the jiggle pin goes up or down.
2/ whether the jiggle pin should be on the front, toward the radiator,
or rear, toward the block / trans, of the housing the t-stat sits in.
as stated in an earlier post,
if you use a suabaru t-stat, the housing on the bottom, the bottom radiator pipe connection,
is not large enough for the t-stat to go in upside down.
after market t-stats are smaller and they could be installed the wrong way.
but since it is a NO NO to use an aftermarket t-stat,
we are not too worried about that, are we.