What are the risks of having an unpiloted CEV in orbit, rather than
leaving a pilot onboard while the LSAM lands?

Would seem to depend on whether the whole post-Columbia NASA safety culture
sticks around for a while, or a little Kranz-type editorial boldness
previals. Can the the already mentioned advantage of having a piloted
capability for either vehicle to be the active rendezvous platform basically
trump any other lunar surface advantages? At least in the minds of mission
mode planners?

We got LOR down reasonably well 30 years ago, but age old ideas of minding
the store, keeping the watch, and having someone left to debrief if
something goes wrong... do those supercede our trust in 21st Century
spacecraft that haven't been built?

JW