Pinion Gear... Is this worn?

[rawfuls]

Before you say anything, YES IM A HUGE NOOB.
This is probably one of the first times opening up a diff, or actually looking into gear internals.
I'm retarded.
Anyways...

I took a look at the pinion, not sure if it's machined like this (Kinda goes down) then it LOOKS like it's wore down..

Anyways, here's the pictures in question..



Here's the rest of my findings..
A bearing that is now in very bits of pieces..
http://i53.photobucket.com/albums/g6...4/IMG_4721.jpg
http://i53.photobucket.com/albums/g6...4/IMG_4722.jpg
http://i53.photobucket.com/albums/g6...4/IMG_4720.jpg
http://i53.photobucket.com/albums/g6...4/IMG_4725.jpg

It certainly looks like it's worn, except I'm not 100% sure since I've never opened up such stuff..

I still need to crack open the front diff and tranny to take a looksee on any other wearing parts.. I guess this is the downside of running a Medusa 36-50-3300kV on 4S in this baby..

I also need some new grease to make it all happy, any suggestions?