Ed could not have signed better role players for the minimum. I also don't think he could have gotten anything back of value for Evans or Green- if he could have even found a trade partner. Theo and Marshall are probably a bit better than advertised and can at least give spot minutes.
As for Evans- he kills them out there 90% of the time. For every oboard and forced TO he has a lane violation or fouls someone at 30 ft when in the bonus. Not to mention, he shoots like Royal Ivey.
Speights is ahead of Evans on the depth chart. The only reason he gets minutes now is that Brand is out. I expect <7 min/game after Brand returns, and no role after this season.
This team will be hard to watch on offense this year. They have a collection of guys who can score but are not true scorers (the Andres, Brand), scorers who are 22 or under, scrubs who endanger public safety when they shoot and shooters who can't defend a lick (Marshall and Rush.)
There is no "system" that makes these pieces fit on offense. They will be better when their young players are ready to carry the load.