So by that logic, Buchanan was a better coach than both Geoff Marsh and Bobby Simpson? The fortunes of the team were far better when both of those 'losers' left.
Fact is you could look at it the other way too; perhaps the measure of a good coach is that the team continues to do well when they're gone. No team should be so dependent on a coach that all falls apart when they leave because that's a failing of the coach in not setting up the team to do well when they do inevitably go. The legacy of Bobby Simpson is often talked about even amongst today's players. Why not the same standard apply to Buchanon? I just find it quite a bit more than a co-incidence that QLD won the Sheffield Shield for the first time (having only once come close about 10 years before) with him at the helm and that under Marsh or Simpson, things like dead rubber tests and losing on the sub-continent were a problem but under him, both of those little issues were knocked on the head. Regarding QLD, it wasn't as if the bankers were the ones who did all the work either. In the final it was unfashionable or new playes who did the job. A coach should be given credit for getting the best out of players. Certainly the Test careers of guys like Hayden, Langer, Martyn,
Hussey and Lehmann were all but over before Buch came along and I don't think it's a co-incidence that players who'd been looked at as 'talented but unfulfilled' were picked and did well. He didn't make them bat well, sure, but I'm sure his input in telling them, for example, why they weren't in the side just yet, what they had to do to get into the side, etc. was very important in organising mentally because technically they were largely fine and they didn't develop a whole heap of talent overnight.
A coach doesn't make good players perform to their best. The players are ultimately responsible for that. A good coach creates the conditions where good players can do well but off their own back. So I guess what I'm saying is that Buch certainly can't be given credit for the fact that Warnie took 40+ wickets in England or Haydo's 375 but he can and should be given some credit for creating the right conditions for success. To quote the great binary God in Futurama "When you do things right, people won't be sure you've done anything at all"