This idea is related to the I/O Window. At the moment in pro tools there are a number of issues with Aggregate devices. Often when using multiple audio interfaces in OS X 10.11 the I/O doesn't match with the devices in the I/O window. This can make determining which input is which incredibly difficult.
My suggested solution is two fold.
One - make it so that aggregate device I/O and the I/O correlate with input names...