Solomon ran more than 2 seconds slower in the finals in Moscow than in the finals in London 1 year earlier. That is clearly a red flag that something was wrong. You might claim that the month Symmonds spent with Leo at altitude at La Loma helped him get his silver medal...except that Solomon was the T&FN favorite to win a medal going in off his win in Monaco and performance elsewhere, but he just ran slower.
In 2012, Solomon only finished 3rd at the OT and didn't show much at all until Monaco, much like Jenny did when she won her gold.
In 2013, Solomon was winning things early (including Nationals) but seemed to run out of gas at the WC. And somebody needs to tell him that he doesn't need to win each qualifying heat: That takes too much out of you, unless you're as dominant as Rudisha. You only need to run in front and win the final.
Peak when it counts. I think they're trying for too much, too early.