"You won't see whack-a-mole based specifically on number of creatures or mulit-attack. Initiative is rolled per group of creatures by the DM."
The dm group initiative rule is for "identical" creatures and only the most basic simplest multi-foe combats result in the all-one side then all-other side you describe.
Ogres with orcs or goblins with wolves or even just leaders, shamans, skirmishers and calvary create multiple "groups" even if they are groups of 1.
I am **not** on the OPHW mole crisis ruins dnd quoth-streamer-gods-from-on-high side but the assessnents have to include a variety of common combat encounter setups to have meaning.
The dm group initiative rule is for "identical" creatures and only the most basic simplest multi-foe combats result in the all-one side then all-other side you describe.
Ogres with orcs or goblins with wolves or even just leaders, shamans, skirmishers and calvary create multiple "groups" even if they are groups of 1.
I am **not** on the OPHW mole crisis ruins dnd quoth-streamer-gods-from-on-high side but the assessnents have to include a variety of common combat encounter setups to have meaning.