#4. Michael Chandler
Former three-time Bellator lightweight champion Michael Chandler does not necessarily have a bad chin. While his durability isn't the greatest, it is his fighting style that creates the conditions for 'Iron' to get wobbled and hurt as often as he does.
Whenever Chandler throws a punch, he steps in very deep and commits his entire bodyweight to the blow. While it consistently leads to knockouts, it also renders Chandler exceptionally vulnerable to being countered on his way inside.
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Due to his stylistic choices, 'Iron' owns 11 wins by knockout, but has also been on the receiving end of KO/TKO losses 4 times in his career, nearly half as many times as he's knocked others unconscious. Even in fights where Chandler doesn't lose by knockout, he is often wobbled, dropped and hurt like in his recent loss to Justin Gaethje.
Perhaps the most classic example of Chandler being a glass cannon is him rocking and dropping Charles Oliveira throughout the 1st round of their UFC 262 bout. He went on to get dropped by a counter-left hook and finished by follow-up punches in the 2nd round.
#3. Johnny Walker
At one point in time, Johnny Walker was thought by many to be a future UFC light heavyweight champion. Members of the MMA media were hopeful that the power-punching Brazilian would one day prove to be a stiff test for the then-reigning UFC light heavyweight champion Jon Jones. Unfortunately, Walker's poor striking fundamentals led to 4 of his 7 losses coming by way of knockout.
While Walker's vicious knockout power enabled him to defeat most of his foes in the 1st round, he has been rocked several times, even in his victories. The Brazilian was famously KO'd by Corey Anderson, a wrestler. Even his KO win over Ryan Spann was tainted by Walker being dropped twice.
His pre-UFC career was also riddled with instances of Walker being hurt several times in his fights on the Brazilian regional scene.