I... never said that...? Anyway, I don't disagree with your post in some points - it seems clear that it's the Driver shaping the transformations for W and Accel, while even the Sonozaki with Drivers still take their forms from Gaia memories. I'm not arguing otherwise.
In spite that, there's evidence, that I've already posted, including direct wording from the official site, that the drivers+memories do transform the bodies of their users too, even if the resulting transformation isn't the same as the Gaia memory by itself.
Specifically, here's another bit, the description of the Gaia Processor, that colorful part on the Double Driver, bellow the memories, that lights up when they're inserted:
http://www.tv-asahi.co.jp/double/ri...This=true&TB_iframe=true&height=180&width=390 左右のガイアメモリから得た「地球の記憶」のデータを
翔太郎の体へエネルギーに転換して送り込み、
肉体を変化させる。
It says that the data of the Gaia memories is converted into energy and sent to
Shotaro's body, transforming
the body. The text specifically says that it's the body being transformed - by the energy converted by the W Driver.
Really, I think the official text there should make everything pretty clear. W is a complete body transformation just like a Dopant. He isn't just a mix of Dopants though, because the Driver converts and manipulates the Gaia Memory's data, resulting in a different design from what you'd get with the Gaia memory by itself.
There's something else interesting in the official description, about the Gaia Armor, the external shell covering W's body.
http://www.tv-asahi.co.jp/double/ri...This=true&TB_iframe=true&height=180&width=390 It mentions how the carvings/slits on W's body exist to expel the excess power of the Gaia memory... Do you remember Yesterday? She did the same, manually, to avoid being corrupted by the Gaia Memory's power. So, really, W even has a part of himself designed specifically to avoid the excess power that a standard Dopant can run into.