If he's looking at doing it for a living, it may cost more per hour but if he's not wanting to wait around to instruct in the multi it'd be better to rack up hours in a twin doing private/comm. than to do the private in a single, then the twin for the comm. then have to buy multi time...? If that makes any sense, my head is spinning after reading that.

You from Lubbock by the way? I'm possibly moving there in a few months and am wondering what my options are for a CFI gig... pm me if you have any info, thanks in advance.