The scouting report on him is that he is a three-point specialist who is too small to defend many guards. But in a combined 81 minutes over his past three games, Cook has missed all eight of his three-point attempts. His numbers in 18 Golden State games — 3.3 points on 37.7 percent shooting, including 28.6 percent from three-point range, 1.1 assists and 1.2 rebounds in 12.1 minutes — won’t wow front-office executives.
https://www.sfgate.com/warriors/article/Quinn-Cook-tries-to-make-most-of-Stephen-12747762.php
I don't know if there are veteran guards out there who have been released or just are not on a roster now.
But they better have other plans for the post-season.
Playoffs are not the time to help develop a very marginal player.