U-joint vs pot coupler

Abodysrule said
...or an expansion weep hole, as 72bluNblu says...that is totally plausible. Hot grease could weep through the hole and along the groove, relieving stress on the seals.

And the bearing would remained sealed, since the groove would be inside of wherever the bearing is installed.

And yeah, in this application it shouldn’t need anything, it should practically last forever with whatever grease was added during assembly