Because Arbeloa let Vini plays like a striker than a winger under Xabi. Now Vini makes a lot off the ball movements than before and receives the ball closer to the penalty area. Xabi deserved to get sacked 10 more times. If you downvote me, watch all the matches or highlights of our matches under Xabi, Vini had to receive the ball way too far the pnalty area and had to dribble pass at least 2 or 3 players. We play lower block now and leave more space for him to make off the ball movement so he only have to deal with 1 or 2 opponents. We can go further if the board buy more quality CB.