Can ECM kill an injector

[DVT873]

Baby Cummins, 2014 ISB. Replaced all injectors due to codes and almost unable to run. Cylinder cutout showed three bad. #1 and I think 3 and 4. Notes at work. Day later truck back,#1 injector bad. No codes but had a definite miss and making a lot of black grey smoke. Using Insite cut out injectors. When #1 cutout engine smoothed out and smoke quit. Swapped 1 with 3 to confirm injector and not cylinder. Problem followed injector. Replaced it and the UVC harness to the injectors. No codes, 20 mile road test, ran great. ASSumed (I Know) it was a bad injector. Returned to service. Back next day, same issue, #1 injector again. Again no codes. Suspect ECM at this point but would like to verify. Is there anything Insite can show me. Tomorrow I am going OHM injector then try using a noid light on the injector. Might even try a scope which I have never done. The fact that all three places I use for Cummins parts all have 1 or 2 ECM's in stock make mes think they might be a problem. One last thing. Any source other than Cummins for the ECM? A search Fri. and yesterday didn't show me much AND what is the quality. Thanks