I think the issue is that the Army Council of the IRA still have a controlling influence over the Shinners.Of course, I'm only thinking that when the Dáil gets down to business that if MM relies on the past to rebuff SF, which he has done effectively before, I'm thinking it won't wash with ever increasing numbers of the electorate. Time, and the fact the current SF TDs have had no participation in the IRA (save Dessie Ellis) is bringing forth that detachment.
It's like a business that was set up by the Mafia but conducts itself within the law and has a properly constituted Board but the Board still really take orders from the Don. Some will point out that the business is run properly. Others will point out who is really in charge.