What are you on about? I just said that 4/4 tackles could all be fouls rather than two being successful and two fouls. I never said unsuccessful tackles weren't classed as fouls.
Plus it doesn't suggest that at all? You do realise that sometimes players can double up on another player? So you may be in the correct position but due to having an extra man they make the tackle rather than you. Plus like Sarni said, depending on a teams playing style, you may not always be in a position to do so due to the tactics given to you, not because the player personally can't do it as well as the other guy. There are loads of variables to stats that can only be found out by a actually watching the player consistently.