You are asking a question that most attorneys would never answer more than “it all depends” in response. Was the ground under everything flattened and leveled out before the gravel was placed? Was the ground then compacted with a vibratory plate compactor? What kind of gravel was used (river rock, graded, mixed crushed, etc)? How was it placed? Was it compacted? And possibly other questions.
I would say that you already made the call to place what you’ve placed and there it is now. If anything you did was incorrect, then the building/slab may shift or tilt. If it was mine, I wouldn’t mind slight movement of it anyway. Many smaller metal and wood buildings are placed now without much consideration of frost depths (I.e. footings below the frost depth) and they may rise and drop a little as the subsoils freeze and thaw. Adding the new footings that you are doing for the lift will act to solidify the rest of the slab from side movement - they will act like anchors if nothing else. They certainly won’t make anything worse.
