I have opened up quite a few gearbox's and this is the first bike I have seen with a sealed bearing in that position.
If it were my bike I would remove the damaged inner seal, replace the outer seal and keep a close eye on things. (oil on the tire)
You will be no worse off than you are now and you could be concerned about nothing.
Some of the 19 rides in my shed
2014 V2, Snoopy
2009 Wee, Pumbaa the pig
WR450F, The Blue Postie Bike
YZ250N smoker with rego, Stinky.
Yamaha MT09 (FZ09), The Scud missile.
Club Lead not Club Med.
He with the most toys wins.
Out of my depth in a puddle.
Live life on the edge you will see more that way.
Ridding a motorcycle keeps things in balance.
At the end of each trail and at the end of each day history is made.