Ok, so here's how it goes down:
When it says check for the side that lost, and not the individual units, that means you count up enemy models lost per side. The losing side then takes morale checks. For example:
You Ogryns eliminate 5 warriors and no wraiths. The warriors kill 1 Ogryns and the wraiths kill 3. The Wraiths and Warriors must take morale checks because the Ogryns killed 5 models and the Necrons (combined) killed only 4 models, so each unit on the Necron side must make a morale check for losing combat on the whole.
It's like if you saw the unit next to you get torn apart. Even though you may kill some, you'd still be a little shaken by your comrades' deaths.
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