Answer:

Actually, I don’t believe northerns push muskies off weedlines at all. In general, muskies are bigger (they eat everything they can swallow, which includes smaller pike and muskies … big pike will eat smaller muskies).

Predators often hunt together wherever there is lots of food … the only time there is likely any “pushing off” structure is a situation where several large predators hunt the same zone … any meal-size muskie or pike had better stay out of the way.