But I don't think he had disdain. Chuck still cares for his brother, he just doesn't trust his ethics. So when he heard Jimmy was hired by Davis & Main and Howard's positive opinion of him, Chuck had to see for himself.

When he first showed up in the boardroom, Jimmy was visibly shaken but Kim's reassurance helped him keep his composure. Then when Chuck directly challenged Jimmy's client service methods, both Cliff and Howard seemed satisfied with Jimmy's answer. Howard still deferred to Chuck, but it was clear that Jimmy had absolved himself of further scrutiny (for now). And Jimmy's interruption helped to clear any further doubts (more for Kim's sake, but still).

Again, I could be wrong (especially in this next episode), but it feels like Jimmy is slowly winning over Chuck. What's interesting is that it looks like Kim is assuming Chuck's role from last season; she wants to see him succeed legitimately, but she can't help but see through his methods.