I also have one Black Madeira,and it have two trunks:
One look healthy,with large entire leaf,and about 5 large figs on it.
The second going the oposite way is very ill with FMVirus,and have 3 very small stunted fruits.
This is a 3 yr old plant,and it spent last winter inground with good protection.
It came out of winter with minimal damage.
I am sure I will have ripe figs this year,because the fruits are allready in the stagnation fase.
I also have 10 fruits on my Black Ischia,inground too,and last year it died almost totally,and this Spring grew from roots has 3 trunks and 10 figs in good shape.
I am going to have ripe figs from Black Ischia too!.
If it ever die I will let you guys know.
It is only a experiment,and I do not expect ever ,that these trees will be worth more than a few ripe,fruits in some years.
These rare cultivars are not to be based on,for fruits production.
For large production,have a couple of Marseilles vs Black,Sal(Gene strain),JH Adriatic,or Atreano,and then you will be covered,and can afford to have fun experimenting,with, those exquisite rare cultivars.