Thanks! I was thinking exactly in strategy when decided to put those minions...
Originally the Grey element wouldn't be stationary, and your suggestion is kind of similar of what I was thinking... But the time got in the way and the design changed...
Grey actually represents the Physical element.... The character would be a swordsman while using the grey Element...
Which would make him be able to fight balanced every element, but he would have to get closer to the enemies because the sword would have a smaller attack area.
This would increase the strategy, since it would be a powerful jack of all trades element.
This was actually part of the original game's concept. Unfortunately I had no time to implement it. So it got cut ;/