I agree with everything but you can have a slick style and still show good power. Rigondeaux doesn't seem to having a problem sitting down on his punches when he needs too. But I guess it could be discipline thing as well. I doubt Lomachenko cares one bit about knocking out his opponent where as Rigo throws a tantrum if things don't go his way.
Special mentions go to Sergey Kovalev. The man literally knocked down and undefeated fighter for the whole 10 count with a jab to the body.
I was going to mention the Champ but its kinda tough cause he's always fighting bums. Still, I wouldn't want to be on the receiving end of one of his body shots.