I dont see it either, and it sounds like it doesn't. Just makes the shaft greaseable, I believe the thought is because the chain case side is running in oil and spins on that chain case side, wear on that side of the shaft is non existent, which makes sense, but now you will have two bearings spinning on the shaft with this expensive setup. To my way of thinking, I dont want the bearing spinning in the first place, so I have no interest this second greaseable additional bearing kit.
I have found the BOP shaft saver wedge to be the ticket when installed on a good shaft. I'm going to use it on my new 2023 which I have found to be a much tighter fit as well. I have a .005" slip fit on it with the bearing. Shaft saver just came today and I'm going to need to fit it into the smaller ID of the 2023 shaft as well. It won't slide in as it stands, so honing out the ID of the shaft or turning down the saver will be required.
Making it not wobble and flex the chassis is not hard at all when normalizing the bearing to the shaft, and I've never had one spin in tens of thousands of miles on all the machines I've ever installed them on. I always check the runout with a dial indicator to confirm there is ZERO wobble. IMO its the best setup to keep the bearing from spinning out of all the things on the market, and prevents problems as long as its installed properly which means normalizing on the shaft and getting torqued properly which means more than what's needed. People are afraid to tighten them up for whatever reason I don't know.