The SAFE Act is basically just a list and disclosure requirement. There are no restictions in the SAFE Act for MLO behavior aside from them not acting as an MLO without being registered, disclosing their number, and not violating the law. Taking applicants with him to his new bank is not a violation of law, but may be a violation of your bank's policy.
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I can't herd the cats anymore, so I just set up the electric fences and let them fry when they stray out of bounds.