I thought it would be
Hunter: strength
Warlock: intellect
Titan: discipline
Hunters don't seem to be disciplined in the same way way Titans are. Hunters are more of free souls, while Titans are the regimented disciplined ones.
I guess it could go both ways though.
English
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I always though it was cause of hunters squishiness and lack of a backup plan so they must be disciplined in combat in order to to survive. You don't get far in combat being a free spirit especially when you don't have a lot of armor. Their lacking of armor makes them disciplined while their speed makes them a free spirit. Works out pretty well.