You'r theorising too much without official evidence.I never disagreed with you :lol
But Mokuton grants a similar level of healing as JuubiJins because it's the Juubi's KKG. Maybe RSM + Hashi's arm can allow Naruto to regenerate limbs.
Mokuton doesn't grant any healing power; Hashirama can heal because of unknown reason. Naruto's and Sasuke's arms were regenerated because they went through an autopsy via Hashirama's cells. Madara did the same thing to injured Obito. Since he went through all that effort and knowing (according to thread's source) he could regenerate it via RSM, he would have done so. This means the seal gave him that power; he lost that seal, he can't regenerate limbs.
All of the buffoons who agreed with this thread didn't go to university and don't know what Harvard Referencing is. That source is not official.