Engine cranking, no spark, no start after having the transmission rebuilt?

It started after transmission (all-wheel drive) was rebuilt and re-installed on the vehicle.

The vehicle will crank as normal but no start.

The issue was identified as no spark from the coil.

Since then:
Cam and crank sensors have been replaced and tested.
ignition coil (coil and igniter combo) has been replaced.

ECU has been replaced.

all ground connections on the engine and body have been cleaned and re-done.

fuel pump and fuel pressure okay.
fuses and relays tested okay, but still no spark.

one irregularity that has been observed is that the vehicle will crank in park, but no crank when in the neutral position (suggesting an issue with the neutral safety switch or inhibitor switch).

would a faulty inhibitor switch cause a no spark issue?

i have delayed on changing any more parts until I get some guidance.

About 11 to 14 codes show up on the OBD2 scan tool, (cannot be cleared).

I have been told that they are not of much use at this time.