It would appear that Finke, Lenzy and Keys are all the same type of wr, basically smaller slot guys, while Claypool and McKinley are bigger receivers. Wilkins who is 6'2" got some time against USC.
What really matters is the the best wrs get on the field as often as possible. We've still got guys like Jones, Robertson who haven't seen much meaningful time but Kelly mat have to dip into that group if somebody is injured and perhaps split out Tremble as a wr as appropriate.