Or it could be the fact the adc isn't clearing the creeps near the other adc fast enough so a blitz support can grab the other adc. If you can't assist a blitz by clearing a descent path to get the adc, then yes please ban blitz. As a blitz support your a frustrating adc that probably still thinks have a minion wave between you and leona is safe. So if you decide to have a blitz support and you want to get kills early, the either clear the wave quick or let the other adc push to tower so a hank could be setup. Otherwise let your blitz support know your passive and he/she will roam to support another teammate.
PS. Don't be surrounded by enemy creeps so a blitz can peel/pull someone off of you.