If you PS the egg to knock Murky into a 40s rez timer you are guaranteed a 4v5. The main purpose of Murky is to try and turn a 5v5 into a 4v4 and hope they blew some important cooldowns on you and eventually run your way back into the team fight. If your squish isn't getting puffer+octo combo'd it is hard to lose that team fight with a full 5 even if your Nova can't PS.