This is orthogonal, but the AOT versus JIT difference between ART and Dalvik is hugely overstated. Dalvik attempted to AOT compile, and when that wasn't possible it also maintains a pre-compiled cache for subsequent runs. Similarly, while ART attempts AOT, for various reasons it often resorts to JIT with some types of code. They both behave incredibly similarly.

ART is a ground-up rewrite of Dalvik. The AOT thing seemed to take root as some sort of differentiating talking point.