So I was playing in trainer and I had stolen my opponent's titan, then replaced it with my own vampire dagger. I then endowed my crusader using the vampire dagger. It gave the crusader the attack and ability upgrade, but also gave it momentum. That turn I played a second crusader, then endowed it with the dagger next turn and it also gained momentum.
I mean, I'm not complaining, but I just thought I should put that out there.
Edit: I played a third crusader, endowed and got the same result.