I spent the 6 tokens on Hierro and replaced Marquinhos TOTY for him. So far I'm very happy that I picked this beast and will likely keep him for a very long time! His interceptions, his strength combined with his really good passing and dribbling (agility is very good for a CB) makes him one of the best CBs I've used in FIFA. Especially regarding the fact you only need 6 tokens to get him.
So far I've used anchor on him which felt already good and boosts is strength and aggression even more and boosts his jumping to the maximum. He's always a threat when you have a corner kick and wins every heading duel defensively as well. I've bought a shadow chem style now as he's not one of the fastest CBs and hope that I will see that pace upgrade in game.
Of course you can link icons with everyone but he'll make strong links to popular players like Alba, Piqué Scream, Butragueno, Villa, Guardiola and many more.
I play him alongside Alba (LB), Diego Carlos RTTF (CB) and Capa IF (RB). My defense honestly feels like a wall out of steel - on steroids.
Tackles and interceptions
Jumping and heading
Really good agility and reactions for a CB
Strong links to popular defenders and midfielders (Piqué Scream, Ramos, Butragueno, Guardiola, Villa and many more)
Generally incredible value for little effort
He lacks a bit of pace (could be fixed with shadow chem style)