I think you've just answered your own question! There's absolutely no way on earth that Robson is being held to account for his tactics, even in the form of a devil's advocate, by anyone at the club. That's not good enough. I don't know, or care, whether it's Gunn or anybody else's job, but someone has to assist the inexperienced guy during his period of failure. Surely this was the whole strategy, hence Glass, Goodwin and now Robson? We get an inexperienced coach with some good attributes (Robson seems fairly decent at motivating a team), and then give them the support to build on the others. They haven't done that. In order to back a manager, you have to, and you have to have a plan and a strategy and you have to give him more than one window, and especially not just one window with a massive turnover of players and a hit and hope signing policy from across Europe (a bit harsh, I know!).
But I'm not saying the above for the benefit of Robson. I'm saying it because I said it for Glass, to a lesser extent Goodwin and now the same problem occurs with Robson, so I'm making this point for the next guy we get in. Robson has to be held to account for his own obvious failings, and I point them out every week. However, the club have to take a huge portion of the blame for the failure and if they don't, it's just going to continue to happen.