They need offensive coaches. McDaniels is the QB coach as well as OC and he was rumored to be bringing along Jerry Schuplinski, the assistant QB coach, when he was taking the Colts job. Scarnecchia (70) and Fears (64) are old and could retire at any time. That leaves just O'Shea and Nick Caley. If they could get Kingsbury to take the QB coach position, that would make sense. That's arguably a step down from college OC, but if he wants to get into the NFL, it would be a nice launching pad. But it's hard to imagine him staying in that role long.
They may also see O'Shea as more of a position coach and less of an OC, though there's a good chance they lose him if they pass him over again.
Do people remember the "Greg Schiano defensive coordinator" rumors from last year? I'm not sure if those actually had any merit or not. We shouldn't discount the possibility that Belichick is just meeting with people he thinks have interesting perspective, the media gets wind of the meeting and draws connections that may or may not be there. We know Belichick meets with college coaches and we know he doesn't say much to the media directly. Who knows what he's thinking?
(apropos of nothing, just realized O'Shea was a teammate of Troy Brown's at Marshall for a couple years)