I have argued all along that McCarthy will become a domer because:
He's Catholic; he's of Irish descent; he's gone to parochial school his whole life; and his big brother is already there. Powerful "blood-is-thicker-than-water" motivators to head to South Bend.
However... here are a couple of reasons for optimism:
He's an Ohioan and tOSU is his state school; JT is widely revered in his hometown of Youngstown; JT is a Christian on and off the field and runs tOSU program like a family -- the McCarthys apparently like that a lot; the last well-publicized OSU vs. ND match-up featured an intra-family storyline of sorts, with A.J. Hawk going up against Brady Quinn, his future brother-in-law, and tOSU won that one bigtime.
So, perhaps Danny will do the unexpected and go to his in-state school; play for a thinner, more modest and all-around better coach, and hope to match up with his big brother in a Bowl game somewhere down the line.
I still think ND is the logical prediction, because blood really is thicker than water, and Danny's blood is Irish. But hey, I'm just sayin' ...perhaps.