The CN version could only resurrect 1 Ninja, and the triggering of Serpent was referring to his 30 combo chase, and not the serpent.
But on the side note, isn't it sneaky that even if they use every, these, their and all the words that indicate multiple units, the sentence also says "selected unit" and we know we can only select ONE. So technically, the statement is still right in a sense. ;P
*P.S. I do think that the translation is horrible on this one and they should consider re-translating this one soon to prevent misconceptions.