I've never had problems with darkness on the BM.  Can you make it dark?  Yes.  Can you make it bright and sparkly?  Definitely.  There is a different feel between the normal high-plate and the BM, but I don't think it's something that can be easily described as dark/bright.  Also, I play humbuckers.

I played a High-Plate Skyliner not too long ago side by side with the Bluesmaster.  The main difference to me was that the OD on the Skyliner was just raging open.  Not compressed or even tight.  Raging! hahaha.  It wanted to feed back on itself with little to no effort.  I was able to set it up darker, not sure if I was trying to emulate the BM, but with the deep switch (actually mid booster in those, but whatever) and playing with the presence control, I could take some of the sparkle out.  I could safely say it could get as dark as a BM on normal settings.  That said, I prefer the BM for its cleans and I like the blackface inspired OD.  I'll be getting a Zendrive here soon, just to have other flavors of OD though.

I see. Sort of like huge sounding then as opposed to dark. It sucks cause I have the OTS.

Just 

Hahah no, I also like Overtone for what I think it is.

...I guess its too early to say but I'm probably gonna itch to get another amp anyway.