Whether the new strategy represents a blunder by Gregory Roberts that undercuts his fellow gun prohibitionists, or is a calculated move that is supported by his fellow gun prohibitionists, remains to be seen.
Not really that difficult to understand, most of them want guns to not be carried in public (and after that not to be owned, as places like San Francisco voted to outlaw handguns even in the home after carry had ceased to exist for generations.)
Now it looks hypocritical if the same organization calls for guns to not be hidden, as it is sinister and dishonest, and calls for guns to not be carried openly at the same time.
Yet you will find many gun control organizations receive money from similar and many of the same sources.
So different ones can incrementally support reduction of gun rights on a different front without seeming hypocritical.
The war to them is against the guns, how they get there are just individual battles.
In fact they even create pro-gun organizations of gun owners in order to influence their enemy and make them more ripe for 'reasonable restrictions', as well as speak on behalf of gun owners as the pro-gun representatives in favor of restrictions.
The AHSA or American Hunters and Shooters Association being such an example.
Now arguably open carry is a bigger threat to anti-gun agendas than concealed carry. It is open, it is obvious, and once the population is not startled by seeing it because they are accustomed to it (like in Arizona) the war for the mind is largely won.
Concealed carry on the other hand is a hidden statistic, at the emotional level, the level where politics and legislation are often won and lost, it is nearly a non-player except to those that carry.
It doesn't get people comfortable with guns, accustomed to them, it doesn't startle or announce its presence, and really has no emotional impact on society at large, positive or negative.
People around concealed guns can remain just as anti-gun as ever, never being confronted by the reality that there is guns all around them not causing harm. And the population in the middle remains as ripe for anti-gun and pro-gun messages, not impacted by the presence of the guns they don't even see.
For this reason it is not an emotional threat to the anti-gun agenda.
Open carry has to be over reacted to immediately, the public kept uneasy and uncomfortable by displays of it, otherwise the hearts and minds of the people are affected gradually, they become accustomed to the presence of guns, and guns are no longer the boogie man. That hurts anti-gun efforts across the board.
The public at large are aware of such guns, not just those carrying, so it has a pro-gun impact if it lasts beyond the initial phase (which can have an anti-gun impact through shock and the fear of the unknown and unfamiliar.)
Part of the Gun-control strategy is not asking for everything at once, that would clearly seem unreasonable, and lead to little progress overall with a lot more opposition.
Instead they only ask for one new thing at a time generally, gradually, a 'compromise'. After that they can work on the next 'compromise'.
However obviously this means some in different regions or at different political levels will be focused on a slightly different specific compromise at a given time, unless it is one they feel has enough momentum to try and push at the national level, at which time they speak in unison to be more effective at that critical moment.