I think Pyke's ahead of Seaby for the second ruck role. Seaby ahead if Mumford went down.
In general play they seem to have different roles though. It's been a while since I've seen either of them play, but Seaby would play as ruck traditionally does and go looking for touches, while Pyke played a kick behind play alot. Whether he was told to do that or just felt more comfortable there I don't know. But I can recall him taking quite a few marks in defense.
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