Aside from the bug of Munitions bots getting no noticeably buffs from additional ranks/int stacking, I suggest that they are buffed visually per rank.
Rank 1: Standard pair of Munitions bots
Rank 2: Munitions bots are taller, now have a gun on each arm. Turret form sports two revolving barrels instead of one
Rank 3: Third Munition Bot is spawned and controlled
This, while being a general fun idea also allows enemies to assess the threat of your munitions bots as opposed to having to guess how much you've invested in them. The same idea can easily be applied with the same effect to field drones and attack toys.
They just.. look different. Rank two is leaner and sleeker than Rank one (and definitely the best looking of the 3 ranks). Rank 3 look more like Rank 1 (chubby bot) with some upgrades and bright white paint job.
As for testing before you invest in the ranks, just buy the rank in the powerhouse, summon them, see if you like the appearance. If not, just free retcon the advantage.
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What? How?
As for testing before you invest in the ranks, just buy the rank in the powerhouse, summon them, see if you like the appearance. If not, just free retcon the advantage.