Looking at your pictures and reading that an IC pipe boot came off, you have numerous entry points for dirt, into your engine.
You may very well have a dusted engine which will account for the loss of engine oil pressure.
A turbo in good condition will not leak oil past the seals. The stock PCV system for the 7MGTE, routes the vented gas into the intake, which carries oil vapor and will coat the IC and pipes with oil.
Since your PCV plumbing has been removed, oil currently is not being dumped into your IC by the PCV.
Your turdo seals could be shot and allowing engine oil into the compressor section of the turbo and being pushed into the IC system.
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