He will ruin his career. Boca is a shitty team in a shitty league, thats only good for players aged 18-20 to get used to a bunch of talentless butchers kicking about.
After that, you go to the brazillian league, or straight to europe. What stays after age 22 in that shitleague, is basically a talentless hack.
So yeah, Tevez is going to ruin his career there. If the fans of the rivals dont ruin him first. It is commen when the team is losing 4-0 to end the game by hooligan violenc and trowing concrete from the decript stadium around.
Lovely argentina primera division.