Danny Levi has had his moments in 2020. He has shown glimpses of being a good dummy half, but they have been inconsistent and very much few and far between.
For someone who has reached the highest level of the sport having played 4 tests for New Zealand (all in 2017) and one for Samoa in 2019 ... Levi should be a fair bit better and more consistent than he is. The sad thing is that Lachlan Croker, a converted 5/8, has actually proved to be a smarter dummy half with a lot more awareness about things and where the ball needs to go, but he's also countered that because his execution has been very poor, especially at crucial times.
Levi and Croker have tried hard, not doubting that one bit. Its just been a bit of a disaster in its execution because neither are very good at it.
So as for 2021 with (I think) neither Levi or Croker remaining at Manly, and with Walks apparently staying and the emergence of Schuster, Cade Cust might well be our best bet as a #9 until Fainu is back on the park. Remember that he was a hooker in the juniors and only got moved to the halves when in the U/20s in 2017.