I would say, best move for Lauren - nominate Keanu but somehow still keep him as an ally so he won't target her next week.
Keanu is right that she is the next target after him, but also if he is there and he wins POV/BB she will be booted, so it's kinda moot point.
Ideally, he stays and morgan/keanu snipe each other out next couple rounds, then she can cut vince at the end for ava/will/kelley.