Of course the bearings must be fully seating in their bores during assembly. No argument there.
The small .006-.009" clearance between the rear bearing and crank shoulder is minimal, not enough to cause any problems on cold start and The clearance closes down to less than ,004" on a heated engine. I've measured the clearances and done the math, as you know from a previous debate on the subject and the numbers don't lie. The front bearing does not move to accomodate thermal expansion, at least not measurably.
As before, we can agree to disagree; you in theory and me in practice. I'm fine with that.