I started with the new chibi from Genesis, and got it almost to 4th lvl by killing lots of Enraged shinies. I died, could recoup. so I had to restart again (at lvl 104, mind you) with a new chibi. I picked one of the ones the mod give, a bloodstalker. It worked with the first Enraged, (or maybe it was just an alpha?) and since then it has not gained any more xp. I will change the chibi and see what happens. But I killed 3 more Enraged and no xp.

Later:

No, none of the chibis are working with the Enraged dinos. Even the ones I get when I die.