>>> I wonder if aerating the water speeds up the rooting process?
I think it should, at least changing the water helps too (think; Oxygen, O2).
Rooting in water is not my favorite way to propagate figs at all.
Our Dr. Al (Tapla) claims that roots developed in water are
different from those developed in the soil.
Sooo, it is like (somewhat) starting-over when potting-up.
BTW, those are some huge fig leaves...