#2 Alberto Del Rio
Of everyone on this list, Del Rio is the one who had the most success in WWE. Already well established when he joined WWE, Del Rio was a main player for a number of years in the company.
During his two spells in WWE, he became a four-time world champion (WWE Championship and World Heavyweight Championship twice each), a two-time United States Champion, and won the 2011 Royal Rumble and 2011 Money in the Bank (only person ever to win both in the same year).
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After leaving for the second time, he went back to using the name Alberto El Patron, and has been just as successful in other promotions. He has won the AAA Mega Championship in AAA.
He was the first unified GFW World Champion since GFW merged with Impact Wrestling. It's safe to say that success is in this man's blood.