With several top talents still on the board, the Raiders invested the No. 4 overall pick in Alabama playmaker Amari Cooper, making him the first receiver taken in 2015.
And while it hasn't paid dividends quite yet, several veterans are confident it will, including veteran tackle Donald Penn, who has seen flashes already.
“They had a couple of great pass and catches in this last mini-camp that were really spectacular," Penn told SI Now, speaking of the budding relationship between quarterback Derek Carr and Cooper. "I wish you guys could have seen it.