#4 He was the only one who was always at Shawn's side during his struggle

It is well documented that Shawn Michaels was one of the most hated persons backstage during his first stint in the company. He was arrogant, involved in backstage politics with The Kliq, and basically very hard to work with. After sustaining an injury in 1998, Shawn became even more unbearable, battling his own private issues with addiction.
The only person who stood by Michaels during this turbulent time was Triple H. Vince McMahon himself has revealed that there were days when Shawn would not even be able to get dressed, and HHH would have to help his friend get through the day with all his tasks.
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In fact, when Michaels wanted to come back to the ring in 2002, HHH was the only one he would trust enough to have a fight with. Hunter reveals that the only worry he had throughout their classic SummerSlam 2002 match was to protect Michaels from any sort of injury.