The sooner you deal with this, the better. Dev's being cut out of the loop -- particularly combined with his cluelessness and lack of real contribution -- is a

The sooner you deal with this, the better. Dev's being cut out of the loop -- particularly combined with his cluelessness and lack of real contribution -- is a big warning sign. In this, you can see that things are already getting worse. Expect that to continue, unless the situation is rectified. As for responsibility: He's the one who, frankly, started acting like a douche (or, finally started showing his true colors). He's the one who, fundamentally, needs to change. Yeah, you may be willing to work with him in an honest effort. But don't start thinking that this is your problem. It's your problem to deal with -- meaning him -- but it's not your problem to adapt to his self-serving douchiness. Get together with the team, break out the clippers, and sheer down those points. ;-) P.S. If things don't change, it's going to come down to "he goes, or I go", sooner or later. (Whether to a different firm, or -- in a larger organization -- to a different team that has no interaction with him.) Otherwise, prolonged misery. Also, right now, his credibility -- unreal as it may apparent to your knowing eyes -- is limited. The longer things continue, the more valuable he may end up looking to management. And the harder your argument becomes to make. This is why living with the status quo is a losing proposition for you. Finally, this is just my personal opinion. I may be wrong. But I've put up with some douches, and it mostly always only seemed to keep getting worse. Until I got out.