He does, and he really appreciates that Widowmaker.

Almost a slip of the tongue, he nearly tells her to keep an eye on Sombra. Like he's immediately suspicious of her. His earlier conversation with Sombra regarding their roles here as free agents (implied) didn't help his unease any, but he's nothing but adaptable. Should something come up or should he feel there be a change in plans, he's fully capable of modifying his approach but...

Something tells him that Sombra is trying to get him to stop, or change at least. Most of the time he is adaptable, but his personal feelings still seem to make him hesitate.

"No."

Maybe if he'd been emotionally tamped out like Amélie, it would've been easier.