Krag was pretty busy in real life last time I had a chat with him (few weeks ago). Not sure if that has changed since but he said he should be able to keep his games moving.
I'd suggest replacing Saruman first, and see if the pace gets better. If not, then also replace Kragroth.
I'd suggest replacing Saruman first, and see if the pace gets better. If not, then also replace Kragroth.