I wouldn't say it's bitterness - I actually fully understand why Manning left us to go manage Bristol City - I'm just a little perplexed at the incredibly short term thinking in terms of both career path and earnings that so many of these young managers are adopting these days.
Take Manning's move to Norwich, for example. He's doing great at Bristol City, a club who haven't churned through managers that quickly recently, and has started to build a decent squad. He's likely earned himself a couple more years at least and if he can get them over the hump to the Premier League (possible - they weren't that far off last year, and this season there's a hell of a lot more opportunity at the top), then he's looking at serious, serious $$s and possibly a move to a PL/CH yo-yo type club, given his hipster manager profile.
Now? By moving to a very marginally bigger club in the same division and flunking it, he's got a massive payout in his pocket, but he's also ****ed up his reputation. He's going back to the lower leagues now, on a fraction of what he was earning, and it's going to take him years (and probably actually winning something) before he's built it back up to the point it was.....if he ever does.
Appleton is another classic example, made even worse by the fact that he didn't even move into a manager's position. I'm sure the pay-off from Leicester was nice, but a few years on and he's in the last chance saloon now. If he can't turn Shrewsbury around, his managerial career is probably done at 50.
And now Rob Edwards is doing the same thing - abandoning a job where he's rebuilding his reputation and building a lot of goodwill for a position at a very, very similar sized club where he's surely got a very, very high chance of failure.
I think more young managers should be looking at the Eddie Howe model. Don't jump at the first marginally bigger club to wink at you, instead knuckle down at a club that you've been able to mould over years and years and really achieve something. And then be in the running for one of the seriously big gigs when they come up. Even if he gets fired tomorrow (and he might), four-plus years of managing Newcastle will have made him more money than several Norwich/Wolves-sized payoff and his reputation is still mostly intact and he will get another good job when he wants one.