I have the Pilot and have used it quite a lot with a Scarlet (even flew the One MX and Epic a few times), though the results were mixed.
If you are truly running a stripped down version of the camera, it works great. But like some of the earlier posts mentioned, it's not ideal to limit yourself like that. You will undoubtedly find yourself in a situation where you want to add on some accessories (like those heavy batteries) and then you'll have trouble getting the smooth shots you wanted.
The Scout apparently has an 18lb limit which I think should be good for the Scarlet but I have not had experience with that, maybe someone else can chime in.
To sum up, the Pilot is OK in a pinch for the Scarlet, but if you're gonna lay down some cash to own one and learn to use it, go with a bigger rig.