these were continuation filings?
Doesn't matter. Continuation just means same specification; it does not mean same CLAIMS. And claims are how one defines inventorship.
he was in-house at the time, no?
No, he hadn't joined yet.
so the issues of inventorship, and his authority, and of "cost to prosecute the new filing" are diminished/eliminated - no?
No, that is irrelevant.
But judging from your comments, you can see how confused the jury would be, thus proving my point.
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