This thread might be going in the wrong direction. Each role has more than 1 aspect. Strikers are more than damage, Leader's are more than heals, Defenders and more than high AC, and controllers are more than AOE.
None of the classes have enough powers outside of their base role to serve as another role. But 2 classes can combine their off role powers to fill another role.
Fighters can simulate a strikers damage but not their mobility. A warlord can grant the free moves and shift he needs.
Paladins can heal but have few offensive buffs or debuffs. A rogue can help with that to made the paladin leaderish.
None of the classes have enough powers outside of their base role to serve as another role. But 2 classes can combine their off role powers to fill another role.
Fighters can simulate a strikers damage but not their mobility. A warlord can grant the free moves and shift he needs.
Paladins can heal but have few offensive buffs or debuffs. A rogue can help with that to made the paladin leaderish.