In Revenge of the Sith, we see Vader with his standard blue blade. It is only when he gets his armor and goes through Sidious's trials in the comics that he kills a Jedi, takes that Jedi's saber crystal, and makes it bleed.

I have to wonder if, even as a Sith, Vader would've bled his own personal crystal had he escaped defeat at Obi Wan's hands. This implies that he didn't lose more limbs. Either Obi Wan escapes or Vader defeats him on Mustafar.

I feel that to answer this question, it would all come down to Padme. If Obi Wan managed to successfully hide Padme and the twins (or only child as Anakin never knew Padme was carrying twins), Vader would've built up his rage and eventually bled his crystal. However, if Vader was able to get close to Padme and raise his kids with her, I feel that he would never carry a red blade. I'm not saying that being with his family would turn him back to the light nor make him leave the Sith. I believe that if Vader made his blade red around Padme, it would be the ultimate slap in the face for her (since force choking her wasn't enough in this scenario). The red color would represent evil in her eyes. That would be the breaking point of their relationship.

What are your thoughts?