LOL! Not sure how the SrS will sound through a fusion, but in other threads/forums on TB I will again affirm that the GK MB500 is the absolute best solid state amp in the GK solid state line-up. For the price point, the wattage, general tone, accoutrements etc. probably one of the best on the market; plus it's a 1U. My single issue with it is that there is not a mute switch/function. I had a MB800, but I did not like the "blanket over cab" tone that could not be dialed out, and the Master Volume knob could easily be knocked/moved. Recently learned that MB800 uses a different pre-amp than the MB500. Please let TB know how the EBMM Special sounds through a GK Fusion.
If players also use the D800+ with a Special, the D800+ dominates the 800w solid state market for more modern tones with any Stingray. It completely has any accoutrement that is/should be within/on a solid state amp...except it's NOT rackable.
With that said, a Stingray, no matter the year, makes ANY amp/cab/combo sound better

Good Luck!