Ok so basically you admit that it's not his skill but rather his speed and athleticism.
And yes when you have a 260lb HW who comes from football and has horrible defense, no set ups, no angles and poor punch selection it's safe to say hes knocking guys out because of his athleticism and power.
If Mitrione was a skilled striker he would actually use his size and reach and wouldnt have to do that gay ass karate in and out stance he does looking to land some shitty out of control power strike.
Instead he would use his size and reach and actually measure his opponents and put together a decent jab and right hand which we rarely see him do. He relies way less on skill and way more on speed and instinct and flat out being wild.
That's not to say he isnt dangerous because can crack but skillwise he downright sucks.