Well, no one else seems to want to post, so I'll toss in my 2 cents.
I am pretty sure conditioning is to get him as healthy as possible, and as FULL as possible (so he won't be too tempted by the eggs) HEALTHY sems to indicate needing a variety. FULL seems to say it doesn't matter.
Personally, I think you could manage with only one type of food, as long as it was good stuff, but a variety wouldn't hurt. (Translation- Go with your own instinct.)
Out of curiosity, What are you breeding? I am trying to decide between starting on crowtails or deltas, myself.