All knowledge is not remembered I agree. If all knowledge was simply remembered we could not come up with new things. Maybe the key is how we recollect things we know.
Example: We both know p. I arrived at p by combining x and y while, you got p by combining x and z.
We can have abcedfg... and α β γ... and 1234... but we may never get anywhere with it. An important aspect of knowledge is putting those things to use.
Eventually at t3 for example we would arrive at the derivative of p, (p'= x,y or x,z or x,g...)and p can have multiple derivatives, exemplified above.
Knowledge is derived from piecing things together from things we know and things we don't yet realize that we know and things that no one knows yet. New variables can be introduced at any time this is the reason that knowledge is not simply from recollection, hence learning.