Four-star quarterback KJ Costello chooses Stanford over USC and Michigan

KJ Costello, the nation's #4 ranked pro-style passer, committed to Stanford on Thursday, choosing the Cardinal over offers from USC and Michigan.

The 6'4, 213-pound Costello is rated the No. 34 prospect in the country by the 247Sports Composite. He's ranked as the No. 4 player in the state of California and the No. 4 pro-style quarterback in the 2016 class.

Costello is a tremendous add for a team that didn't take a QB in the 2015 recruiting class, and a nice centerpiece for David Shaw and the Cardinal well before the grind of the 2016 recruiting campaign begins. While this recruiting class won't be complete for another 11 months, Costello is a sensational player for Stanford to build its class around.

It's been an unbelievable journey. I am proud to announce that I will be playing football at Stanford University #nerdnation #StanU

— kj costello (@kj_costello) March 26, 2015

Follow KJ on Twitter at the handle @kj_costello.

Check out Costello's highlights from his sophomore year:

Check out his junior year highlights here: Costello Junior Year Highlights.

Some more thoughts from SB Nation Recruiting:

Costello visited Stanford at least four times, most recently Jan. 24, according to his 247Sports timeline page. He visited USC at least three times, most recently March 7. Michigan offered last May, and he took a visit soon after in June. In the end, Stanford has been all-in on Costello for some time, even electing to not sign a quarterback in last year's recruiting class.

That move sent a clear message about how much the Cardinal wanted Costello, but also about playing time. And Stanford signed only two combined QBs in the 2013 and 2014 cycles. USC signed two elite prospects last year in Sam Darnold and Ricky Town.