Strictly speaking, Iodide is not a ligand. It will form a true salt with silver ion. It is not ideal in that it forms the Silver salt, forms HI and is oxidized to the Iodate. I am not aware that it is used in the modern bleach due to the difficulty of fixing out AgI. Improperly fixed Ilfochrome prints show yellow highlights of unfixed AgI, and all prints kept over a long period of time have a mild residual acidic odor even with extended wash times.
In addition, Ilfochrome uses a patented multilayer structure to reduce contrast.
In traditional Ciba bleach, it contained Sulfuric Acid which forms the soluble Silver Sulfate during bleaching and thus the bleach acts in some regards like a blix. The newer bleach uses sulfamic acid which also forms a soluble salt with Silver ion.