That's fine! I mean, it's not so much a 'personal opinion' issue as I wish it were for Evangelion (souls are a literal thing and the metaphysical laws about them form a core part of Evangelion's story), but I'll assume it applies in this case.

Intelligence itself has literally zero bearing on the presence of the soul, but in this particular case, the implications about their intelligence work well enough.

Or I'm going to say it does because otherwise I haven't got much of a leg to stand on.

(Why would you ask Kaworu to make his own decisions about anything, his answer is always 'self-sacrifice solves everything!')