i dont see any big walls until $17
Not yet.
Most of the ask walls are market plays, not sellers.
This one at $16 looks legit and will have to bought out...
They are all legit as long as there are in the order book. And unless you have done statistical analysis on the walls your statement about how they look doesn't mean a thing.
You definition of legit is strictly material and does not account for emotion.
A seller sells. Market plays retreat under trades.
or
One stands and delivers, the other sits on the fence.
Of course it doesn't mean anything. But after watching markets for 30 years, you get a vibe...