McGloin played under O'Brien during his coaching tenure at Penn State.
Yates, meanwhile, has extensive experience with the Texans organization. The 30-year-old quarterback earned the franchise's first-ever playoff victory back in 2011 over the Cincinnati Bengals. Yates has played four of his six seasons with Houston, and all seven of his career starts have come with the Texans -- the last in 2015 when he earned two wins and a relief victory over the Bengals.
There are no good answers when attempting to replace a one-of-a-kind talent like Watson.