I don't think Lily has fake followers, they just aren't active, everyday she gains more than Behati, and personally I don't see her doing that. Sara has 3.1m and has about 100k-150k range of likes in a decent picture while Taylor' pics(2.9m almost 3m) has cropped and filtered pictures that appeal much more to her followers, has 110k-200k. Same goes for the ''veterans'', they got famous with their accounts a long time ago and not every single follower is active today, for example the most liked pic in IG its from Kendall when she had 30mil, and now she has 50m and still hasn't surpassed that.
I continue to think Sara, Taylor, even Elsa and Jo have a huge amount of likes compared to other models (jo is starting to grow tho) and a good average of likes comparing with their number of followers.