jakyasar, you're on the right line. Just that the client should also have executed a deferral election prior to the deposits if he really wants to dot the Is and cross the Ts on doing it right.
I'm pretty sure that a spousal beneficiary of an Inherited IRA retains the rights to transfer to an IRA in their name or a Qualified Plan that accepts rollovers. The monies then would no longer carry the inherited IRA characteristics but be subject to the rules of the IRA or Plan to which they were rolled.
The biggest draw back is losing the exception to the pre 59 1/2 10% penalty on early withdrawal as a death benefit. The biggest benefit is typically longer RMD period if the spouse is younger than the decedent.