Is John Connor Doomed by Canon as of Terminator 3 to die by an Arnie model or does the Broad Strokes sequel nature of Terminator Salvation hand-wave that away?
Why does SkyNet keep sending terminators back to later and later points in John and Sarah's lives when they are increasingly suspicious? Why not keep sending them to the earliest possible time?
Why does SkyNet even have a time machine if the whole "send an assassin back in time" plot was a last-ditch effort? And how did they intend to test this?