There’s been a lot of change in the San Francisco 49ers ’ wide receiver corps since the end of last season. Kendrick Bourne left for the Arizona Cardinals, while Jauan Jennings entered free agency and remains unsigned nearly two months after it opened. Meanwhile, the 49ers upgraded the position by signing future Hall of Famer Mike Evans and Christian Kirk for less than the price Jennings was reportedly seeking. However, one player who remains and will likely seek a larger role is Ricky Pearsall, who enters the third year of his rookie contract projected as either a WR2 or WR3 on the depth chart. They still have Demarcus Robinson, who enters the second year of his contract, plus Jordan Watkins and Jacob Cowing. The 49ers are significantly stronger at the position. Yet, they still decided to add another rookie in the draft with their first selection, taking De'Zhaun Stribling at No. 33 overall after trading down. Stribling’s selection has received mixed reactions, as many viewed him as a reach at No.…