Scenario and what do you think

You have a fed Gnar on your team who has with a Brand who's already 3 items deep at around 20 minutes. Enemy team is grouped inside 3 walls and consist of , very soft. Gnar is 95% rage. Would a 2 man wombo (also assisted by Janna) between Gnar and Brand not kill 4 of the 5 of those? I saw this and my mouth just started watering....but our brand decided that he was too bronze for the glory kills :(

Am I wrong or just expecting too much from people?