Since 1989, only 3 safety's/corner backs have been selected #4 or higher.
Eric Turner, Charles Woodson, & Shawn Springs.
By contrast, 22 DT/DE have been selected #4 or higher since 1989.
That draft position deserves & mandates playmaking status production in college - you know, interceptions.
At least Elliot produced yards and touchdowns in college.
Similarly, Bosa produced sacks in college.
Drafting a guy because you hope & project that he will be like a NFL player is not a draft strategy.
Collegiate production matters when selecting a player at #4 (no matter what position -- even an OL's production can be measured).
If he wasn't a ball hawk in college - he ain't going to be one in the NFL.