[JohnR34231]

Look at the depth at the position.

U$€ has #1 overall QB from 2014 Max Browne and another top QB prospect from 2015 in Ricky Town.  Stanford signed Burns in 2013 and Chryst in 2014 and didn't take a QB in 2015, IMO in large part to increase odds of getting Costello.

At Stanford, he's got a redshirt year with Chryst likely starting as a RS Soph.  He's practically guaranteed of playing at least one year and maybe two if Chryst leaves early.  At U$€ he's got the real possibility of never getting a chance to play ever, as Browne and Town are right ahead of him class-wise.  Browne will be a RS Soph starting in 2016 or Town will be starting as a RS Frosh.  Stanford doesn't tend to sign as many elite QB prospects, so the odds of Costello actually playing at Stanford are greater than at U$€.

When you factor in the educational opportunities, you have to like Stanford's chances.  Speaking of that, on a related note...

I think that is a strong argument, but Costello recently was quoted as saying that he isn't afraid to go to a school where there will be a lot of competition. You could certainly interpret that as him saying he doesn't care how many elite QB's U$C signed this year (actually they signed another one besides Town); that it isn't going to be a factor in his decision.

[JohnR34231]

Look at the depth at the position.

U$€ has #1 overall QB from 2014 Max Browne and another top QB prospect from 2015 in Ricky Town.  Stanford signed Burns in 2013 and Chryst in 2014 and didn't take a QB in 2015, IMO in large part to increase odds of getting Costello.

At Stanford, he's got a redshirt year with Chryst likely starting as a RS Soph.  He's practically guaranteed of playing at least one year and maybe two if Chryst leaves early.  At U$€ he's got the real possibility of never getting a chance to play ever, as Browne and Town are right ahead of him class-wise.  Browne will be a RS Soph starting in 2016 or Town will be starting as a RS Frosh.  Stanford doesn't tend to sign as many elite QB prospects, so the odds of Costello actually playing at Stanford are greater than at U$€.

When you factor in the educational opportunities, you have to like Stanford's chances.  Speaking of that, on a related note...

I think that is a strong argument, but Costello recently was quoted as saying that he isn't afraid to go to a school where there will be a lot of competition. You could certainly interpret that as him saying he doesn't care how many elite QB's U$C signed this year (actually they signed another one besides Town); that it isn't going to be a factor in his decision.