#1) No weak link
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Almost every faction in professional wrestling has had a weak link. Right from The Four Horsemen to the nWo, to DX to The Nexus. If a group were big, they usually had one bad member. Not The Shield, though.
All three of Dean Ambrose, Seth Rollins, and Roman Reigns were equally impressive and equally important to the success of the group and that is a very rare thing in a faction.
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Edited by Shruti Sadbhav