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Well, 3 rounds of invisibility isn't that much.
On level 6, it's definitely impossible to pick out the weakest units. Seriously, you can't, because each unit is very useful. But if what matters most to you is the stats of the squad, and you're willing to overlook things like magic and ranged attacks/invisibility, then yes, they are the weakest on level 6.
O God of Earth and Altar,
Bow down and hear our cry,
Our earthly rulers falter,
Our people drift and die,
The walls of gold entomb us,
The swords of scorn divide,
Take not thy thunder from us,
Take away our pride.
G.K. Chesterton: English Hymnal
Bow down and hear our cry,
Our earthly rulers falter,
Our people drift and die,
The walls of gold entomb us,
The swords of scorn divide,
Take not thy thunder from us,
Take away our pride.
G.K. Chesterton: English Hymnal