My rescue adenium came from the Lowe's left for dead rack also. I think they must have cornered the market on badly grafted plants.
To add insult to injury, I left it outside and while I was away from home we had some epic rain resulting in a split on the caudex.
The one pitiful flower that was on the plant when I bought had a white throat, the petals were mostly a deep rose with a pale pink edge and I thought it was nice. I am trying my hardest to get it back to health. (My son named this plant Nicki Minaj - no comment.)