Completely left-field, but I'm really just enamoured with the idea that Over/Master are Shouma literally enveloping and powering himself with the embodiment of his happy times (his Gochizous). As shown by the henshin effects, the suit is literally just a conglomeration of the hundred Gochizous in the jar, as opposed to the basic undersuit with the snack armour on top of it like the base forms, so they're supporting Shouma quite literally and directly.

It's also cool how unlike his siblings, his "minions" help him/give him the power to fight, as opposed to being convenient servants.

All other Gochizous/Rider tech seems to max out at Blizzard Sorbet levels too going by the good ol' make-believe stats. So it makes sense that the next step for a genuine power up was to just use a jar full of them