Death recap is garbage

Was playing Leona is an ARAM. We were in heated battle form 100 to 1, lasted maybe a minute, I started with 3000hp.

Death recap: Renekton: 300 damage (AD) Thresh: 150 damage (mixed) Gnar: 350 damage (AD)

so... Where's my missing 2200 Damage? And what about the other 2 champions? It would be nice for death recap to actually mean something so that I know who did how much damage, what cc I took, etc so that I could build against it.