>>21808200Kobo/Zeta are within a week or two no sweat, the question's Kaela. Her growth rate per week is 30k right now but that'll probably peter off pretty soon to like +20k, +10k etc. Being optimistic I'd ramp it down like +25, +20, +15, +10 for a while. Sana gains 4k a week right now but isn't standing still anymore so probably will at least keep up her pace (assuming she doesn't actually go all out and take Holo seriously and incline).
So Kaela probably will pass Sana within like 2 months at the usual rate from how they slow down a lot in growth after about a month.
However it is possible Kaela could blow up depending on how/who she collabs with. She likes League and Hearthstone and that's really unusual in Holo so she might manage to bring in a new crowd, etc.