I dunno Mooch...being a drummer myself, though finesse is super important on all instruments, this doesn't add to what makes a drum sound big.
If we're going to look at "big" there are lots of things to keep in mind.
1. Room and how you use the room: This is the most important as far as how big your kit is going to be.
2. Mics and how the kit is mic'd: Equally as important as #1 because if we close mic in a big room (close mic meaning as close to the heads as possible) the sound size decreases. Lower OH's instead of higher ones...no distant OH's at the back of the room...all this stuff plays a role in how big a kit will sound.
If we don't close mic "so close" and we raise the OH's a bit higher and then add in some distance mics, now we're bringing the room into the scheme of things.
3. Tuning and what heads are used as well as bottom heads: Quite a few people forget about this and it's a shame because it's so easy to do, it can totally change your sound for the better. Some people pull off the bottom heads....these days, leaving them on and tuning them correctly is the better choice. The reason being, if you have both the top and bottom heads on toms working together, you get more sustain. Add that into a big room or a kit that is mic'd for "big" and you just changed not only the sound, but the game.
Tuning is so important because you can literally accentuate a room based on how the drum tuning reacts within that room. A great kit tuned poorly can sound terrible in the best room. The more sustain/resonance you have on the kit, the more sound it's going to throw around the room.
Head selection is also important. Those Black Dots most of us used years ago aren't really a good choice today. They rob the drum of tone in my opinion. We're better off with good old regular REMO's, Pin Stripes or even Evans Hydrolics etc. This to me is what makes a drum kit big. Not the finesse of the player. Of course you want to smash cymbals with the right amount of conviction without making them sound obnoxious, but it's pretty common knowledge that most drummers (at least in rock situations like Zep) should be smashing a kick, snare and toms at all times unless the dynamics of the song do not call for that.
There is nothing worse being an engineer, than to have to change out a drummers hits because he hit them like a sissy. A rock drum needs either a nice smash at the center or a rim shot center hit at the same time. Anything else is just lame for this style of music. But take Bonzo out of the room he was recorded in, take the resonance off his drums (listen closely to out takes of his kit...they really resonate to the point of not sounding too good by themselves at times, but boy do they fit in the mix) and the big sound goes away no matter how hard he hits them.
So though I do feel finesse is important, to me it has nothing to do with how big or small a sound source is.
-Danny