Dodgers ace Kershaw likely out until August with lingering shoulder injury

Kershaw underwent MRI showing shoulder inflammation needing more healing time.
Kershaw expressed frustration at diagnosis despite not feeling discomfort throwing.
Dodgers activated Chris Taylor from injured list and added Jake Marisnick.
Kershaw attended All-Star game but could not pitch due to injury.
Kershaw had strong first half of season before being sidelined with 10-4 record and 2.55 ERA.