"Oh, of course I’ll help you Harry! Now what was your question again Tom? Why was your soul salvaged? Funny story that, well you’re immortal too. But not because of your horcruxes, those were a terrible idea by the way, no, the reason you are immortal is because when you were that awful looking homunculus and stole Harrys blood to resurrect yourself, you in turn became another master of death, which I quite honestly wouldn’t mind taking orders from you, hon. 