You should probably provide better examples and watch the fights.
Koscheck - GSP doesn't know the orbital is broken in the first round, he's not a doctor. He certainly knew there was some damage and opened up with right crosses and left hooks and tried to take Kos out. The suggestion that he only jabbed after round 1 is laughable. Kos stayed back and didn't engage after round three. But Kos was throwing the right wildly and no sense in GSP running into a punch. But GSP threw some vicious rights, lefts and kicks to Kos' head.
Hardy - Again you have your facts incorrect. GSP had an armbar in the first round and and a kimura in the fourth round. He had 11 takedowns, 13 guard passes and took Hardy's back 5 times. Hardy is slippery and quite frankly GSP's BJJ is sloppy. I don't know where you get this nonsense that "man, he had an armbar locked, Dan didn't tap, he let it go and proceeded to never attempt to sub Hardy." Obviously you missed the kimura and don't know what you are talking about.
https://www.mma-core.com/videos/GSP_vs_Dan_Hardy_UFC_111_Gracie_Breakdown/10017264
http://www.mmatorch.com/artman2/publish/ukscene/article_4733.shtml#.WVGEJOvyupo
As for examples of Hendricks not trying to end fights, I'll cite 5 great examples:
(1) Hendricks v. Condit - Hendricks took Condit down repeatedly and never did any damage. Once he figured out Condit couldn't stop the takedown he was content to repeatedly take him down and do nothing more.
(2) Hendricks v. Lawler #1 - Hendricks never went for the kill. Tied 2 rounds each he got a sloppy takedown late in round 5 for the WW belt.
(3) Hendricks v. St. Pierre - Hendricks had GSP hurt badly in round 3. And what did he do? He clearly smelled blood - it was all over GSP's face. He didn't go in for the kill (your words, not mine). He spat out his mouthpiece, wrestled in round 4 with no ground n' pound just lay n' do not'in, and took the 5th round off to allow GSP to steal the decision.
(4) Hendricks v. Matt Brown - 3 rounds of Hendricks holding Brown down, doing no damage, happy to hump out a decision.
(5) Hendrick v. Lawler #2 - Hendricks never pushed the pace, never had Lawler in trouble, never went for the kill.
I don't take away that Hendricks had two great knockouts against Fitch and Kampmann. But both were on single punches, Hendricks essentially rushing in and clipping fighters who don't know how to move. In fight after fight, Condit, GSP, Lawler x 2, Hendricks is happy to wrestle and ride out a decision.