Is delaying a death timer a viable strategy if you have a horrible teamfight composition?

I just played a game where our darius and khazix started “trolling” the enemy maokai by purposly not killing him when he was at 500 ho. Now the other 4 enemies had like 45 second death timers on them and 10 seconds before they respawned darous finally killed him. Enemy had 3 broken inhibs but we couldnt get to their nexus turrets. Well after that darius teleported in and told the rest of us, who were doing baron to just come and 4v5 while the maokai had 35 seconds left on him.

How viable is this strategy.