Deva Pain was NOT able to see through Kakashi's replacement and raiton bunshin.
From the looks of it Deva Pain was clearly surprised upon learning that Kakashi did a replacement when he was blown back by his barrier jutsu and seeing Kakashi's raiton bunshin.
Rinnegan for all it's hype also suffers from the weakness of the other doujutsus: The inability to see thru kawarimi and bunshins.
Kawarimi and bunshins FTW
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From the looks of it Deva Pain was clearly surprised upon learning that Kakashi did a replacement when he was blown back by his barrier jutsu and seeing Kakashi's raiton bunshin.
Rinnegan for all it's hype also suffers from the weakness of the other doujutsus: The inability to see thru kawarimi and bunshins.
Kawarimi and bunshins FTW