Can you argue the current decrease along the two inductor pieces of a transformer using impedance?
Assuming the inductor is a series wire with no major leakage paths, the current will be consistent over the length of the Inductor.

What can vary is:


the magnetic flux density over the various turns of the inductor,
The voltage drop per turn or turn segment, as this is related to the inductance of that particular piece, 
The Resistance per turn or segment, this also effects the voltage drop, as this usually changes with temperature.
capacitance between adjacent turns


Pretty much a real world inductor has a lot of non ideal elements that can convert the energy in the inductor in various ways, and in variable ways across its cross section, e.g. the wires may be moved by the EMF, which converts to noise. you have thermal losses, you may capacitivly couple to other nodes. you may induce current into a shorted or partial turn adjacent to the inductor.