Well, first you'll have to deal with the delay kind of things, I know you'll say "but the distance is very small"
Even knowing this, some freq. will the cutted off and it can cause more reverb or chorus...

There's a lot of mic technics, like the 8-form, X-form, Y-form, etc...

It will also depends on the mics your using... If you can tell me I can sketch out those methods and results in an "frequency response" chart... I've been working on recordings for a good time...

Hope I've helped

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I couldn't tell you about the delay thing.

The closer one mics to the beater the more attack or point you are going to get and usually less low end tone following the point.

Alot of cats are doing this resonator deal now on kicks I have been noticing. I think they should just put a front head back on and learn how to tune.  What do you guys think?

A mic by the beater and a mic by the front head (two tracks) is cool if you have the time and inclination to mix the two.

My buddy usually samples kick drums anymore with a lot of point and low end.  It translates well in smaller systems cause you get all that attack and the low end isn't there anyways but one still gets a decent kick drum image.  When you play it back on a real system, man that low end just unfolds and it is like one can aurally  walk in and listen to the rest of music/frequencies...it's cool.

LOL
Regarding the resonator bass drum trend felix mentioned and pictured:
I think it's a marketing campaign by the drum manufacturers. Recent trends have been for drummers to downsize their sets from the oodles of toms that were once popular. (Bozzio excepted)
They have to introduce a perceived need for more drums.