I was really unimpressed with Bissouma's last two seasons, but I'd be willing to give him some time under Frank, as he bossed a lot of the games I saw him play for Brighton and there is something there for sure, He hasn't really earned it but I like a good story arc.
I buck the trend and actually rate Johnson for who he is - and he, if deployed correctly as you said, can have a big impact.
Same goes for the most part for everyone. I don't think people can have it both ways - and that isn't to say we don't need reinforcements but i think writing players off when you feel the manager was the biggest issue is a bit absurd.