User blog comment:TB93/Ramiel ruling Hell/@comment-5619706-20170227185434/@comment-26982641-20170227195207

About that, the Mark was the thing making the bearer strong. Dean's strength was greatly increased even when the Blade was absent. We saw that the Mark activates itself when the bearer is enraged (10x10). Dean overpowering vampire, hurting angels is a proof of the strength. When the Blade is taken, the Mark goes full power I suppose. Metatron felt the pain of Mark's strength even with a new-bie user. Cain had millenias experience with the Mark. Dean got abilities and immunities more and more each time he had the Mark. Cain had lots of time the learn and improve I guess. Also the strange fact is, he never exhibits his eyes. Even when angels and demons use their powers etc. their eyes automatically reveals. And it is strange that the Devils trap had 0 effect on Cain. Not sure about trapping tho, I believe (however it is unclear in canon) Cain could easily walk away from the Devil's Trap but he didn't choose to since he always wanted to die.