Wrong thinking!
The crankshaft is indeed locked on the frnt bearing, if you do have some axial play then it must be 2 things. 1) the crankshaft was not pulled out to its maximum before pusing the collet to the bearing or 2) the front bearing has some play which is normal in cold conditions.
Then there is the issue of space of the shaft at the main bearing, it must be there!
The crankcase does expand more than the crankshaft, if you do remove all the play the crankshaft will be locked up, the space will give room for expansion.