>I know imperial powers so I can figure why people die.
>My question is why he outmelees almost everybody. I'm talking
>about straightforward automatic melee hits and manual skills.

I'd guess it was things like imperial offense giving him an additional attack. Haste also adds an attack. Tactics giving him extra free dirts & kicks. Edges that help him with defenses.

In the end it comes down to he could get an extra 1 or 2 attacks every round (think of it like having 5th & 6th attack). If you are going up against someone with only 4th attack, you'll get outmeeleed pretty quick.