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I couldn't find an answer for these questions that came to mind.

In both profiles of Zagstrukk and Grotsnik I noticed they are listed as having Cybork Bodies. Cybork bodies confer a 5+ invulnerable save. Their profile shows a 4+ save. No mention of Heavy Armour. Am I to assume they have a 4+ invulnerable save? Or a 4+/5+

Just follow the rules as written:

They have a 4+ armor save plus Cybork bodies which gives them a 5+ invulnerable save.