Regier falled hard in 2005-2011 drafting. That set in motion a lot of failures to come, because there's a missing generation of Sabres (Murray also had a hand in shipping away the few there were).
Murray didn't fail on the tank. He failed on building a team. Bogosian, ROR, Kane, and Lehner, all for different reasons, weren't the leaders to surround a young, cocky prodigy. The apple was rotten from the start.
Botterill failed at team building. He gave the prodigy carte blanche, then proceeded to blow assets adding trivial pieces (Scott Wilson), and outright failing the swings he did make (ROR, Scandella). Sadly, you have to give him credit for the raw talent he left Adams. Dahlin, Samuelsson, Jokiharju, Mittelstadt, Luukkonen, Cozens, Johnson (we'll see), Thompson is, it turns out, a lot of talent. No matter how you slice it, Murray and Regier didn't leave their successor anywhere near this war chest.
Adams has won BIG on the teardown trades, and not just in prospects. Alex Tuch is who we all wanted Eichel to be.
Now Adams has to do the hard part. He has the most talent and assets of any Buffalo GM in history to win a cup. Some patience is definitely still needed (Quinn, Peterka, Savoie, etc.), and some isn't (Bryson, Bryson, Bryson...Bryson).
Sidebar, the best thing about the post-Eichel era....is I don't just get excited for 1 line to come over the boards anymore. Every line can score.