Regardless of the rod brand or model, I'd wager the vast majority of rods can be cast with either top, bottom or mixed hand emphasis provided the line match accomodates it. As someone pointed out, Dana proves that with any rod you hand him. The Solstice Series is certainly capable in this respect as Kush points out even with the 16'1" and an extended belly line.
What might also be a factor is the caster's technique. As Simon Gawesworth points out in his presentation at the Sandy Clave if the bottom hand pulls the rod tip too early in the stroke it creates a circular path and you lose power. So (if I may paraphrase) it's a matter of establishing the path of acceleration before you pull the bottom hand in, and whether you achieve that with a fixed upper hand position moving the arms down and forward or you do it with the upper hand tracking a longer horizontal path from rear to front, either will produce a good powerful cast if done correctly.
It's possible that a stiffer heavier blank would combat this fault by forcing the line forward, but I think it's fair to say such a rod would be a poor greased-liner choice for most people's tastes.
The joy of a greased-liner like the Solstice lies in the lightweight, smooth loading feel; casting on autopilot and getting the most out of the fish you hook - summer or winter.