Well there's your problem. Sherdog will pollute your mind, but that didn't happen.
Barboza was the one who landed that spinning wheel kick on Njokuani, not the other way around. Njokuani never rocked him.
Cerrone did drop him, as did Varner, but thats it for his UFC career (and MMA in general). Ferguson didn't drop him, Bobby Green sure as hell didn't hurt him in any way. Castillo did hit him with a couple of good shots in a row but he was never knocked down. He hit him with everything and the kitchen sink, but all of that happened as the result of a takedown, hence the fight has one knockdown recorded and its on Barboza's side, not Danny's.
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Sherdog would lead you to believe he gets dropped every fight. Other people just jump on the narrative but it's happened twice in his whole career.