The model for AFL Fantasy pricing is a little more complicated than SC.
As each round is played, the model becomes slightly more complicated to look at, however the early Rounds, particularly Round 1, are simpl(ish) to look at.
Witherden at a B/E of 147,
I have him on a B/E of 88.0 x 1.008 = 89
Worpel at a B/E of 17,
I have him on a B/E of 68.2 x 1.008 = 69
Because over 90% of a players price is retained after Round 1, it is the round with the lowest relative price adjustments, as each round progresses, that retained % for each round drops. Just as an example, after Round 2 it might be 86% of the original price is retained + 6% of the Round 1 adjusted price, and again, 8% is open to adjustment etc.
Quite happy to say I'm wrong, but let's see how it works out.