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Model size determines how many models can be in contact with one model 
There are 2 model size types in DO: regular and large
regular-size model is any model from human to horsemen and it can be surrounded up to 4 regular-size models and up to ? large-size models
large-size model is usually a monster like troll or giant scorpion and can be surrounded up to 8 regular-size models and up to ? large-size models

This video demonstrates 1 large-size model vs 8 normal-size model contact 

Unit1 > Unit2 attacking up to +4 models
Unit1 > Unit2 defending up to +2 models

Unit1 = Unit2 attacking up to +2 models

There is a limit of maximum models number in contact which depends on units size