No brian, set driven key wouldn't give me the results I needed since SDK only gives the result of two set keys with the movements in between each set key. I needed the hydros to expand and contract independently and "naturally" rather than mechanically. In other words, if I moved a leg left and right rather then forward and backward, the hydro had to move according to how the leg moved. If I used SDK, then I would have had to set a key for every possible movement of the leg. The method I used of point and aim constraints took away the extra animation work that SDK would have required. This way, I dont have to touch the hydros at all.