hamstrings are involved in barbell rows. fact.
triceps are involved during dumbell flys. fact.
abs are involved during squats. fact.
rear delts are involved during masterbation. fact.
whats your point??? you will never increase your bench by strengthening your lats, and youll never grow lats from doing bench.
as i said once before, it is possible that lats could cause your bench to suffer if you never trained your lats and were powerlifting bench press for a few years. then, in that extreme case, they become a proverbial "weak link"... outside of that rare exception, lats dont play any role in bench, despite the very minor ancillary useage.. just like rear delts during masterbation..