I think you're talking this idea of Fainu having bad defence into your head. After reading that it sounds like he is a lazy slob that constantly gets ragdolled in the middle, letting in try after try and linebreak after linebreak. Our middle defence (and defence as a whole) was great last year. It was a lot better than every Trent Barrett/Api Koroisau year before it! Pretty sure Api missed the most tackles in our squad and perhaps even in the whole nrl in years like 2018?
Fainu is a playmaker that delivers crisp service, but importantly, in the right places as he has a good vision around the ruck and feel for the game. Api was off the field for 15 or so minutes last night and Penrith kept ticking on because they are a team filled with playmakers, so Api most of the time just needs to provide good attacking runs out of dummy half (his main strength) to target markers that aren't square and break down the ruck. Off the back of that the halves link the backline and players like Kikau.
He didn't work for us in the sense that we lack playmakers so whenever we hit form it was off offloads and jinking runs. That's great to watch, although is very inconsistent and fell apart in big games. We had no fallback except in 2017 when Green and DCE formed a relatively good partnership.
Fainu was outperforming Api significantly in 2019 with his vision, passing game and also his running game (which is so similar to Api's). Often when he wasn't on the field and Api was on for his stint we lost some sharpness in our attack. We had a choice of who to keep, and we kept the better dummy half. Api works at penrith as he doesn't have to worry about a lack of speed or a lack of playmakers. All api has to do is create momentum. If you put Fainu in the Panther's 9 jersey they'd be the same. They kept winning comfortably when api was injured mid-season. Fainu's stand-down stuffed us, that's all that's wrong with this choice