Fifita was in the poo with the NRL, it was likely a political decision not to award him the MOM in GF. I thought this was the general consensuses in 2016.
Having recently watched the reply of the GF though I feel alot better about Lewis getting it. Even if Lewis himself seemed surprised and felt someone else was more deserving he had an outstanding game and was really humble about it all.
Something alot of fans probably forget though is that Lewis had kinda of a mixed bag season 2015, at least in the first half of it. Many fans wern't that happy or impressed with his performances. I wasn't one of them, although he had some errors and penalties in him you could see him trying to inspire and fire up his team.
It all came together in 2016 and there was less pressure on Lewy to be the point of difference. Class player, we should grateful if we ever have a player of his standard again. As much as we have some professionals in our team they aren't Luke Lewis. His ability was so huge and he could have such an influence on a game and his squad.