OK let's all just calm down a bit.
A rear suspension is a rear suspension is a rear suspension. GBar, G-Link, Quadralink, LateralDynamics 3link... all have the same hinderance if you want your car low... framerails and trunk floorpan.
There's no way about it, if you want your car silly low you will run into differential axletube clearance to the framerails at full bump. GLink is designed to retain the factory bumpstops and not to have the pumpkin collide with the trunk floorpan. Quadralink cuts the trunkpan out between the framerails and raises it, for two reasons: 1) so that a stronger reinforced boxed section can be put in there to support the load from the shocks, and 2) to gain additional pumpkin clearance at the low ride heights that Quadralink is lusted after for. I'm guessing the Quadralink relies on the coilover's bumpstops for full bump/bottomout protection, and if that's true and the factory framerail bumps stops can be removed, then there you go, that's a good extra 2" of low that can be had without worrying about the rear end hitting the framerails.
As for the topic of just using shorter coils on the G-Link, I can't believe it's still going on. IF you're to use a short coil (but to be safe can only be marginally shorter) then you have to up the spring stiffness to better protect against harsh shock bottomout with the reduced bump travel available. Simply reducing the free length of the spring without increasing spring stiffness is a disaster waiting to happen. And when you consider the recommended bump travel range of a 5" shock is 3" (street) down to a minimum of 2" (racing)... is reducing the bump travel of the shock via shorter coil really worth it for ~only~ a maximum of maybe 3/4" drop (depending what eye-to-eye you're starting with) overall?? I don't think so.
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