#5 Goldberg

In my humble opinion, Goldberg could possibly end up being one of the most ideal superstars to compete against Drew McIntyre in his WWE career.
The Icon carries a tremendous reputation within the squared circle and has never sidelined the idea of returning back to the company one fine day.
Cody Rhodes' uncle is a WWE Hall of Famer. More details HERE.
Since WrestleMania 35 would be an ideal time for a match like this to happen, bringing Goldberg in would directly elevate McIntyre's stature within the company.
Both the superstars could carry each other to a fine match on the similar lines as Brock Lesnar Vs. Goldberg at WrestleMania 33 for the Universal Championship.
While the WCW legend might not be very impressed with the idea of losing to the former NXT Champion, he could certainly pass the torch to him in one way or the other and turn him into a very big deal.