The SNM had no official position on the issue of independence. However, there were obviously the believe that the 1960s Union was not fair and needed to be reviewed.
Any hope for revival of the 1960s union was dashed when, shortly after the overthrow of the dictator, the Mogadishu leaders declared their own government without consulting or involvment of the SNM leaders. Mogadishu folks were more interested in looting and pillaging the state organs rather than help revive the country from the brinks.
That was the straw that broke any hope of a Unity's back. And as they say the rest is history.