Bathtub Drain Leak near Concrete
Unfortunately I must agree that the entire assembly should be replaced. You will need a completely new "waste and overflow kit". I have encountered similar situations and was able to repair it without removing the tub. It won't be easy, but if you enlarge the hole in the drywall enough to give you more room, you can probably fix it without removing the tub or additional concrete. 

Both leaking areas will cause significant problems if not repaired correctly, and I have to say I have never seen a tub shoe that was sliced and offset in that manner. Good luck.