There's an important callout here that often someone's "showstopper" isn't correctly viewed as a showstopper elsewhere. If the someone calling out the showstop

There's an important callout here that often someone's "showstopper" isn't correctly viewed as a showstopper elsewhere. If the someone calling out the showstopper isn't the final approver or able to sway the group that it's a showstopper then suggesting a follow-up validation to demonstrate the showstopper can be a good strategy.