Board Thread:General Discussion/@comment-27464043-20151230192612/@comment-27020644-20161123150601

Another good point that sort of disproves this theory is that, in the comics, the Soul Stone absorbs souls. This happens in 2 ways. The first is if a weilder of the Stone wants to absorb souls. The second way is that the stone wants to absorb souls. In the comics, the Soul Gem activly tries to steal people's souls. Adam Warlock once owned the Gem, until he found out it was trying to steal his soul.

This theory doesn't cover soul absorbtion or the stone's sentience. This theory makes the stone sound like it's life giving and protecting, which is pretty much the exact opposite of what the Soul Gem is in the comics.