As mentioned a few pages back, looks like he cycled most of SF2014, which is why there's only a couple of photos of him at the finish.
Why wouldn't he cycle most of it?, it's a bike friendly course, why would he pull up short of a timing mat, take off the track suit pants, run over the mat, run back, put the pants back on, rinse and repeat?, there's no need. Anyway, if he was doing that he wouldn't do it wearing track pants he had to keep taking off and putting back on, he'd just wear his heavy baggy shorts he's seen finishing in.
So, he ran across the mat with crowd four minutes after the gun, probably with the track pants on, ducked off the course shortly thereafter and rode the bike virtually the whole way, except probably for who knows how far, and ran it to the finish. This would have been an easy one for Frank.
He's probably done a solo trip from LA to SF and done a solo bike cheat, whether he anyone with him on the trip, who knows, wife maybe? Hard to be believe he could have done a solo cheat on some of his other 'marathons' though.