Ted I would think it would "absorb" all the thrust or none of it.
In this case the inner race has a threaded hole whereas a set screw could be installed. Of course these bearings are off the shelf units for whatever use they can be fit. Not really intended for marine use. Just like all "marine" engines (new).
I'm think'in I'm going to need to unbolt the flange from the trans and slide it aft about 2" to clean and neversieze or otherwise lube the shaft. Otherwise it will corrode itself to the inner race and I'll be right back to where I started.
I wish I had a lignamvita "steadying bearing".
North Western Washington State USA