He definitely has more aggression than Rugani. I think Rugani reads the game better, though.
If anything, I see Romero as more the robust kind of CB that would replace Chiellini.
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In fact, I can't recall he last time Rugani slid-tackled anyone. Not that that is a bad thing, cuz good defenders that read the game well tackle less methinks.
I think Romero
just likes to tackle (which are my favorite kinds of defenders)