From
www.dicitonary.com
Quote:
MAY
aux.v. Past tense might
1. To be allowed or permitted to: May I take a swim? Yes, you may.
2. Used to indicate a certain measure of likelihood or possibility: It may rain this afternoon.
3. Used to express a desire or fervent wish: Long may he live!
4. Used to express contingency, purpose, or result in clauses introduced by that or so that: expressing ideas so that the average person may understand.
5. To be obliged; must. Used in statutes, deeds, and other legal documents.
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As you can see, the word 'may' in and of itself NEVER indicates that there is a choice or a lack thereof. It only indicates what is permitted. So your examples read as follows:
"The squad
is allowed or permitted to be joined by a heavy weapon platform..."
"One model in the squad
is allowed or permitted to be upgraded to an Exarch for..."
"The Guardians
are allowed or permitted to be armed with Plasma and Krak grenades..."
"The unit
is allowed or permitted to be joined by a Warlock..."
"...
is allowed or permitted to be mounted in a Wave Serpent..."
So again, does the wording for the Wraithlord allow or permit you to field it without a heavy weapon? Because the use of the word 'may' does not always indicate a choice in the matter.