pettis had a majority of his success on sluggo routes, i dont know where you get the entire route tree from, considering he isnt nearly as explosive or shifty as ridley and doesnt have anywhere near the stop-and-go ability, and also his double catching and struggles to catch in traffic would also argue against your point that he can run the whole route tree along with the sure and reliable hands. his awareness seems to be lacking a bit, as he doesnt work depth and soft spots very well, doesnt work the sideline well either. hes a fluid athlete and moderately lengthy guy with good(not great) top speed and average explosiveness/suddenness and is above average at best in every other regard. he isnt exactly comparable to calvin ridley who has an NFL veterans level of savvy and understanding of how to succeed at the wr position, and absolutely elite ability to change direction to execute routes, along with elite awareness to position himself well and great ball tracking and body adjustment all of which he uses to make catches in and out of traffic all over the field.
plus, ridleys YAC game is far superior, which says a lot considering pettis is the top return man in the nation.