and I'm saying you're full of shit.
In-universe, while the Artemis and Areus were developed by a third party, specifically Ran Kotomori, events occurred that led to the MC being granted both the Artemis and Areus for their use, and both Gunpla have been treated as their default unit until the MC traded up, from the Artemis to the Areus. Chances are, it will be much the same for the Helios, unless the game goes out of their way to buck the trend in some manner... and even then, it will still likely justify the Helios as the MC's next step. It's BECAUSE it shares that same aesthetic as the Artemis and Areus that it's logical to assume that the Helios is going to be the MC's canonical upgrade, and illogical to think otherwise.
At most, perhaps someone else will make use of the Helios temporarily, as Sana did with the Artemis early on, but it will invariably end up in the MC's hands. Perhaps Misa may use the Helios as you suggested, but it's not going to be HER Gunpla, not when she's already established her design elements via the Azalea series of customs.
To assume otherwise, and argue against the clearly established trend is asinine, especially when Bamco is fond of retreading old ground.