what does it take for a engine to run ? compression, air , and fuel at the right time, so if the exhaust is not blocked, it will have air, if the timing is correct it will have compression it just leaves fuel.

you know is has all the above because it will run in the end.

will it run with a sniff of easy start ??

my guess is that it will, so its back to fuel.

you have rail pressure cranking, so that leaves the injectors,

because its always the injectors, time after time, Thread after thread mucho hair pulled out o ....... round and round we go.......

INJECTORS... stick a scope on them see if the computer is firing them ,if you have the correct wave form, pull them out and send them for testing.