I honestly do not understand why he raised the healer, And the main reason is he had a perfectly good ant to raise which was shown to have the healing ability not 5 to 10 panels previously, not only could said ant heal it had all the powers of the other S ranks it killed previously as it had shown in previous chapters. So showing that there was a "moral" issue with raising a dead human I have to question why when the MC had found out there were "moral issues" that they did not just go and raise the better prospect for themselves anyway.