He is a bowling allrounder but is getting rarely a chance in bowling because they have a strong bowling and they normally don't need him as bowler. But today he should have got a chance as everyone went for runs.
He is a big hitter so it is surprising that he didn't get a chance to bat today may be as you said would be injured. But it is still tough to understand why regularly he is taken as a batsman. And this is not just under Sanga only.