Here's a god read on pike from the great lakes. It sounds like they utilize lots of different habitat so could be difficult to know how they will do in Roosevelt. Maybe they didn't get many trout from those 755 cause there weren't many left. 
http://www.in-fisherman.com/pike-muskie/northern-pike/great-lakes-pike/
That's actually accurate. The stomach contents showed a proportionate number of trout in the guts of pike... there are just SO many spiny rays in the system the pike eat lot of them.
