So even the most hopeless looking tank, once you give him the kick might awaken and realize he needs to knock down the ego a notch and learn, and imo that kick in Cad is probably what is going to save him from more desastrous run, and many healer's ignore list.
That said he came up with the sudden attitude changed and asked for advice, otherwise I probably wouldn't have bothered.
Wow, for a potential TL;DR post that I chose to read entirely, I am glad I did read this. This last story makes me very happy for this game. Here's to hoping for more players like him, instead of less!