Can you summon a soul which has already been summoned? We don't know yet. My guess is, if not, then the obvious answer to the immortality paradox is some kind of paralysing agent, which immobilises but does not kill. Perhaps the lightning ninjas can come into their own here, or any techniques with a similar effect to Naruto's rasenshuriken. After that, just clap 'em in irons.
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I think what meguriaufutari meant was that If any of the summons got captured, he could get rid of them (like when he got rid of Deidara), and then just bring them back again. I don't think he meant that if they got captured he would bring them back to life again and have two of everyone running around.