[He turns again, meets Derek's face with a look of understanding. Yes, he gets why it's a concern. Yes, he was reluctant to partner Tom with anyone at first when he was initially resurrected, but... well...]

Tom's stable.

[Dean replies flatly, doesn't cut corners or try and dismiss the concern.]

He reached death number five, and we know, we know for a fact something was taken from him. He was a good man before, he was a brother, and when he came back, he was... different.

[In small, hard to define ways. That inherent feeling that something was snapped, broken in him, something irreplaceable had been taken.]

But he's capable. He's got Isaac's back.