again, blow by would NOT cause oil in the intake or intercooler piping, it would cause white smoke from the exhaust and would cause oil dripping from the exhaust
the exhaust side is separate from the intake side of the turbo, separated by the central rotation housing and the seals...if the seals are bad then you will have oil in the intake piping and/or the exhaust, not from blow by...blow by would cause excessive oil in the exhaust, yes, but it would first need to have blown seals to appear in the intake side of the engine
I don't mean to sound like an ass, I'm just saying...it's not going to tell you much about this situation to do a leak down test
if you very little oil in the intake pipe but a lot in the intercooler piping that isn't due to gravity (the intake pipe is lower than the hot pipe)...that is because it's the seals and not the pcv