let's say that these two reasonable things will happen:
A. Sasuke gets to orochimaru (following his natrual sense of direction when it concerns getting into trouble).
B. Sakon kills Kiba and goes to rendevous with the rest of his team in Oro's Headquraters.

now, since the rest of the sound four are dead (besides Tayuya, but we don't know yet) and Oro has Sasuke, Sakon is pretty useless for him, right?

and Oro doesn't keep useless stuff around, so he'll probably use sakon to check Sasuke's new power, just like he did with the sound trio, to check the lvl 1 seal...