What specifically do you think the iPad inherited from the Newton, that didn't come to it through the iPhone/iPod Touch lineage?
iPhone / iPod Touch / iPad all come from the Newton lineage.
But the person I responded to said “iPod”. The iPod is far removed from iPhone / iPhone Touch / and iPad in terms of interaction modality, operating system, application platform, etc.
The iPod doesn’t run iOS, is a media player not general purpose computing device, like the others and their ancestor, the Newton.
> iPhone / iPhone Touch / and iPad
iPad was basically a big iPod touch, which was basically an iPhone with no modem.