E53 3.0 crank, no start and my wits end

[Minusonekidney]

Good day all. New to the community here, but was referred here by another very complimentary member. Generally speaking I’m pretty good mechanically, but this has me stumped. Here goes…
A few months back, my X5 began eating my battery over a few days if I didn’t drive it I would jump it and drive it just fine. Eventually, it would drain overnight. I replaced the battery, as the old one was diagnosed as bad by an auto parts store. Battery would drain quickly, if unused, usually over 3 days. I began the process of searching for a parasitic draw. Waited until the X5 would go to sleep. Saw the draw drop the way it was supposed to as the car went into sleep. Problem remained. Not long after began to get the 4x4 light with the arrow light on. Then the DSC light showed up. The battery draining the whole time. Charging, jumping. Car would run well when I jumped it. Ordered up a Foxwell with the BMW stuff on it. Pulled the codes, cleared the codes. Jumped the car the next morning, but it would only crank, no start. Pulled codes again. Got some immobilizer stuff, so I went into the live view. I worried the key had a transponder issue. Watched the the computer accept the key and release the starter, and seemingly allow the car to start. Still just crank, no start. Listened for an observed the fuel pump pressurize. Went to the fuel rail and pressed the little valve thing and fuel sprayed everywhere. This is where my lack of skill really shows itself. Used one of those light things that checks voltage(looks like a screwdriver). Checked the coil packs and they light up. I assume I had check for fuel and fire. Figured maybe I had purchased the incorrect battery type. It wasn't AGM. Purchased another battery, AGM this time. Battery went dead over a few days. At this point I can’t even think straight. Pulled fuses, never found a bad one. I’m out of ideas and resolve. I’m willing to do anything to get this thing going as I know it runs great and I love it. Please advise me on any ideas you may have. I read through some similar threads, but couldn’t see a solution in them. Forgive me if I’ve missed something obvious. As a stubborn guy, I wouldn’t be asking for help if I didn’t need it badly. Thank you in advance. I’m willing to go the INPA route if necessary. I just don’t have it is all.