The general consensus in the fan community is that the writers are trying to avoid the use of regenerative blood as a plot device. This is shown by its lack of mention in Season 3 aside from its premiere episode.
The writers stated that the use of regenerative blood only works on a person for a single time to help cover themselves. This would excuse Nathan from not being saved since it was used once on him at the beginning of Season 2.
There is a concept in Heroes called ability immunity. There are some abilities that can hurt or affect the user in the same manner as they affect other people. Elle Bishop was not immune to her own electrical currents, Stephen Canfield was not immune to his own vortices, and Sylar is not immune to telekinesis.
The fact that they were kidnapping citizens of other countries, too, was pretty unrealistic. I agree.
The writers performed a process called retcon, or retroactive continuity, where they retroactively add to the story by inserting details that were not present in the original draft. In this case, they bring back the character of Chandra Suresh to show that he worked previously with evolved humans before having his memories of the incidents erased by Charles Deveaux.
This can be a good or a bad thing depending on if you like the character or not. I think his role in the series is becoming stale as he was originally intended to die in the finale of the first season.
Samson Gray may make an appearance next season; however, the bad guy for the next season is Tracy Strauss.








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