Two problems with your argument - ahri has been out since forever. So even non-ahri mains will more than likely have countless games on her from over the seasons - thus they are veterans even if they are not ahri mains. The same cannot be said for aurelion sol due to his recent entrance to league.
Secondly, the "more likely to get help" is entirely logical. Junglers gank lanes with kill threat. You don't gank for a feeding 0/5/0 lane unless you are low elo and not thinking. You gank where you will get fed, your laner(s) will get fed, and where even if the enemy jungler counter-ganks you will win the 2v2 or 3v3. This is what all good high elo players and pro's do. Secondarily, you gank to shut down "ticking time bomb" enemies - like cho and nasus. But first and foremost, it's about where you can actually most reliably get kills.
No one goes... I think I'll gank for my aurelion sol who's just sitting mid and has no reliable hard cc before level 6. Anivia (vs immobile mage), ahri, syndra, etc. offer this hard cc even before lvl 6 and have more reliable burst than aurelion does that early in the game. Thus, the jungler would see more kill potential in their lanes than in aurelion sol's lane. He might counter-gank if the enemy wants to camp mid and snowball against aurelion sol, but he wouldn't gank because "there's high kill potential".
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