i know that, rythmical.
listen closely:
Producer x makes a beat and sends the TRACKED beat, the "Session" to the mastering house.
Mastering house does "their thing" and mixes, eq's, and processes through the use of various things- limiters, gates, reverbs, delays, maximizers, enhancers, etc.
their JOB is to make a mix sound good "overall"- meaning walkmans, cd players, stereos, car systems, t.v, and radio (though i suspect that radio gets a another treatment of its own).
they dont do anything in regards to creating the actual recording, yes, you are right. they do not pick the kick. what i said, was that it is entirely possible that they had a great base sample- the kick they used was a good kick to begin with- and the mastering house treated it and gave it that extra "punch".
now, if you want to believe that they, all by themselves, just loaded up a kick and mastered it and tweaked it to that degree of perfection, if you want to believe that, ESPECIALLY given their attitude of not spending much time on their beats and wanting to get paid for as little work possible, which isnt the attitude of someone who spends hours upon hours honing the VERY TEDIOUS CRAFT of fine tuning a mix, if you are reluctant to believe otherwise, then ok, fine, believe what you want.
is it possible that they mastered it themselves? yeah, i guess... but not very probable.
i'm done though, you dont want any answer that doesnt say that the heatmakerz tweaked the thing to perfection all by their admittedly lazy selves..... so im not going to bother trying to explain this. you wanted an answer, we gave you the best *most likely* answer, and you rejected it multiple times, so just run with that theory.
and, your last line is exactly what i am trying to tell you. "they dont pick the sample, THEY JUST BRING EM OUT" thats what that kick is, it was brought out better. thats what i am trying to tell you.