Firstly the CT26 from the 7M is the better Turbo
Secondly the oil return / pickup flange has a simple gasket that is a few $$$ from Toyota so shouldnt be a big issue to replace.
also if at any stage the turbo has been starved of oil from the leak i would think upon boosting you would hear the bearing / bush as it would be at least noisy if it was on its way out
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