I'll absolutely debate that cause it's a stupid arguement.
Firstly because Khabib has as many submissions as TKOs many of which were caused by wearing down opponents with strikes and cause HWs hit harder and have a much higher KO ratio. That's a bizarre way to judge striking. A fair way to do it is to compare significant strikes landed per minute to significant strikes absorbed per minute, accuracy, defense ect, that way you don't heavily favor bigger fighters that will have a higher KO ratio simply due to physics.
http://ufcstats.com/fighter-details/032cc3922d871c7f
Khabib
SAPM
1.65
SLPM
4.11
Striking accuracy
49%
Striking defense
67%
http://ufcstats.com/fighter-details/0ff11cc094e887bc
Cain
SAPM
2.33
SLPM
6.37
Striking accuracy
57%
Striking defense
57%
Cain's offense is better but his defense is worse, I would rather get hit less especially when one party has been rocked multiple times and finished a few times due to strikes when the other hasn't.
http://www.fightmatrix.com/ufc-records/ufc-fight-outcomes-by-weight-class/
Fight Outcome Percentages
Division Total Fights (T)KOs Submissions Total Decisions No Contests DQs
Heavyweight 674
49.7% 24.2% 24.6% 1.0% 0.4%
Light Heavyweight 591 42.5% 19.8% 35.7% 1.4% 0.7%
Middleweight 735 35.6% 23.3% 40.0% 0.7% 0.4%
Welterweight 1044 32.4% 19.8% 46.7% 0.7% 0.4%
Lightweight 1032
26.6% 23.4% 49.0% 1.0% 0.1%
Featherweight 499 26.9% 17.4% 54.3% 1.2% 0.2%
Bantamweight 423 24.6% 22.9% 50.8% 1.7% 0.0%
Flyweight 204 22.5% 18.6% 58.3% 0.5% 0.0%
Women Featherweight 18 38.9% 22.2% 38.9% 0.0% 0.0%
Women Bantamweight 136 27.2% 14.0% 58.1% 0.7% 0.0%
Women Flyweight 78 14.1% 20.5% 65.4% 0.0% 0.0%
Women Strawweight 162 9.9% 20.4% 69.8% 0.0% 0.0%
The HW division has an average of nearly a 50% KO ratio(49.7%) vs 26.6% KO ratio for LW fights.